Grade 2 Student Edition

Spots forCOREBCUOILTMfoMrtOheN M.A.T.H. 37 + 32 = 69 +2 +32 67 69 +3037 Spots for M. A. T. H. | Second Grade | Student’s Edition Published by Spots Educational Resources, Brooklyn, N.Y.

Spots for M.A.T.H. Second Grade Student EditionCopyright © 2018 by Nechemia & Sarah G. Weiss, Spots Educational Resources. All Rights Reserved. Published in the United States by Spots Educational Resources, Brooklyn, N.Y. Program Authors: Nechemia Weiss, M.S. Ed., SpEd., Childhood Education Teacher, (Grades 1-6), Brooklyn, N.Y. Sarah G. Weiss, Math Specialist, Brooklyn, N.Y. Senior Reviewer:Brenda Strassfeld, Ph.D. Chair of Mathematics Education Program, Graduate School of Education, Touro College, New York, N.Y. Consulting Reviewers:Basi Blumberg, M.S., Ed. Math Curriculum Specialist, Queens ,N.Y.Sara C. Mizrahi, B.A. Teacher Reviewers: Teacher’s Certification, Yavne Teachers’ College, Cleveland, OH. Editorial and Design Services: Summer Street Content, LLC. Westport, CT. Art Design : William McAllisterArt Credits: © Art Explosion® 800,000 Clip Art by Nova Development / Royalty-Free w ShutterstockCommon Core State Standards for Mathematics: corestandards.org © Copyright 2010 National GovernorsAssociation Center for Best Practices and Council of Chief State School Officers. All rights reserved.This product is not sponsored or endorsed by the Common Core State Standards for Mathematics initiativeof the National Governors Association Center for Best Practices (NGA Center) and the Council of Chief StateSchool Officers (CCSSO).Special thanks to the many teachers, students, parents, principals, writers and work-study students whoparticipated in the Spots for MATH project development over the years.This publication, or parts thereof, may not be reproduced in any form by photographic, electrostatic,mechanical, or any other method, for any use, including information storage and retrieval, without writtenpermission from the publisher.Spots for Mathematical Abilities & Thinking Habits is a registered trademark of Spots Educational Resources.Dot Cards included herein are protected with the following United States Patents. D621,878 S as a Mathemati-cal Educational Set, and D757,175 S as a Educational Set of Cards for Addition and Subtraction.Publisher: Spots Educational Resources 1217 55 Street, Brooklyn, NY 11219Phone: (718) 306-9898 w Fax: (718) 350-8876 w Email: [email protected] w www.spotsmath.comISBN: 978-0-989316​ 8-3-5(Bundle ISBN: 978-0-9851129-5-0 w Set of Student Edition + Standards Practice Book)1 2 3 4 5 6 7 8 22 21 20 19 18Printed in the U.S.A

1Chapter Addition and Subtraction Through Teen NumbersChapter 1 Opener .....................................................................................................................1Lesson 1 Addition Through Ten ....................................................................................... ..3 Lesson 2 Practice: Addition Through Ten......................................................................... 5Lesson 3 Subtraction Through Ten.................................................................................... 7Lesson 4 Practice: Subtraction Through Ten.................................................................... 9Lesson 5 Number Families................................................................................................11Lesson 6 Problem Solving: Both Addends Unknown.................................................13Lesson 7 Finding the Unknown Number........................................................................15Lesson 8 Problem Solving: Finding the Unknown Number in Story Problems......17Lesson 9 Adding to Teen Numbers..................................................................................19Lesson 10 Adding in Two Steps..........................................................................................21.Lesson 11 Practice: Addition with Teen Sums.................................................................23Lesson 12 Using the Number Line to Add........................................................................25Lesson 13 Choosing a Strategy to Add ............................................................................27 Lesson 14 Adding with Three Addends............................................................................29 Lesson 15 Subtracting from Teen Numbers.....................................................................31 Lesson 16 Subtracting in Two Steps..................................................................................33Lesson 17 Practice: Subtracting in Two Step...................................................................35 Lesson 18 Using the Number Line to Subtract................................................................37Lesson 19 Choosing a Strategy to Subtract.....................................................................39Lesson 20 Subtracting a Lot from a Teen Number..........................................................41Lesson 21 Mixed Practice: Teen Subtraction....................................................................43Lesson 22 End-of-Chapter Review.....................................................................................45 i

2Chapter Two-Digit Numbers Chapter 2 Opener .................................................................................................................. 47Lesson 1 Representing Two-Digit Numbers .................................................................49Lesson 2 Place Value...........................................................................................................51Lesson 3 Expanded Form..................................................................................................53Lesson 4 Comparing Numbers.........................................................................................55 Lesson 5 Counting by Five................................................................................................57Lesson 6 Quarters...............................................................................................................59Lesson 7 Ten More, Ten Less.............................................................................................61Lesson 8 Counting On by Ten...........................................................................................63Lesson 9 Counting a Collection of Coins........................................................................65Lesson 10 Making Equal Collections of Coins.................................................................67Lesson 11 Odd and Even......................................................................................................69Lesson 12 End-of-Chapter Review.....................................................................................71 ii

Xxx3Chapter Addition with Two-Digit Numbers Chapter 3 Opener .................................................................................................................. 73Lesson 1 Adding Ones to Two-Digit Numbers ............................................................ 75Lesson 2 Adding to the Next Ten.....................................................................................77Lesson 3 Number Line: Adding to the Next Ten............................................................79Lesson 4 Finding the Missing Addend............................................................................81 Lesson 5 Adding Three Addends..................................................................................... 83Lesson 6 Adding Ones with Break-Apart Numbers......................................................85Lesson 7 Practice: Adding Ones with Break-Apart Numbers.....................................87Lesson 8 Number Line: Adding Ones with Two Jumps................................................89Lesson 9 Number Line: Adding Ten to a Two-Digit Number ......................................91Lesson 10 Number Line: Adding Decade Numbers........................................................93Lesson 11 Adding Only Tens vs. Adding Only Ones ......................................................95Lesson 12 Number Line: Adding Two 2-Digit Numbers.................................................97Lesson 13 Number Line: Adding to the Next Ten............................................................99 Lesson 14 Practice: Adding to the Next Ten ..................................................................101 Lesson 15 Number Line: Adding with Three Jumps.....................................................103Lesson 16 Practice: Adding with Three Jumps..............................................................105Lesson 17 Number Line: Drawing with Two or Three Jumps......................................107Lesson 18 Adding in Columns..........................................................................................109Lesson 19 Adding in Columns with Regrouping...........................................................111Lesson 20 Practice: Adding in Columns..........................................................................113Lesson 21 Choosing a Strategy to Add...........................................................................115Lesson 22 Adding with Three Addends..........................................................................117Lesson 23 Problem Solving: Two-Step Story Problems...............................................119Lesson 24 End-of-Chapter Review...................................................................................121 iii

4Chapter Time C hapte r 4 O pener ......... .......... .......... ........... .......... .......... ....................................................123Lesson 1 O’clock .............................................................................................................. 125Lesson 2 Half Hour............................................................................................................127Lesson 3 30 Minutes: Before and After ........................................................................129 Lesson 4 Time to the Five Minutes................................................................................131Lesson 5 Practice: Time to the Five Minutes................................................................133Lesson 6 Quarter After, Quarter to................................................................................135Lesson 7 AM and PM........................................................................................................137Lesson 8 End-of-Chapter Review...................................................................................139Lesson 9 Cumulative Review..........................................................................................141 iv

5Chapter S ubtraction with Two-Digit Numbers C hapte r 5 Op ener ......... .......... .......... ........... .......... .......... .......... .......... .......... ........... .......... .143Lesson 1 Subtracting Ones from Two-Digit Numbers ..............................................145Lesson 2 Subtracting Tens from Two-Digit Numbers.................................................147Lesson 3 Problem Solving: Two-Step Story Problems, Subtracting Twice.............149Lesson 4 Subtracting Two-Digit Numbers...................................................................151Lesson 5 Regrouping with Dot Cards............................................................................153Lesson 6 Practice: Regrouping with Dot Cards...........................................................155Lesson 7 Regrouping in Columns..................................................................................157Lesson 8 Problem Solving: Two-Step Story Problems, Adding and Subtracting...159Lesson 9 Mixed Practice: Subtracting in Columns......................................................161Lesson 10 Number Line: Subtracting Ones from a Decade Number........................163Lesson 11 Number Line: Subtracting Ones from a Two-Digit Number ....................165Lesson 12 Practice: Using the Number Line to Subtract.............................................167Lesson 13 Choosing a Strategy........................................................................................169Lesson 14 Problem Solving: Story Problems with Change Unknown......................171Lesson 15 Problem Solving: Story Problems with Start Unknown............................173Lesson 16 Practice: Mixed Problem Solving..................................................................175Lesson 17 End-of-Chapter Review...................................................................................177Lesson 18 Cumulative Review..........................................................................................179 v

6Chapter Three-Digit Numbers C hapt er 6 O pener ......... .......... .......... .......... ........... .......... .......... .......... ................................181Lesson 1 Exploring One Hundred ................................................................................ 183Lesson 2 Numbers to 200................................................................................................185Lesson 3 The Base-Hundred Numbers..........................................................................187Lesson 4 Place Value in Three-Digit Numbers.............................................................189 Lesson 5 Practice: Place Value in Three-Digit Numbers............................................191Lesson 6 Reading and Writing Three-Digit Numbers................................................193Lesson 7 Expanded Form................................................................................................195Lesson 8 Comparing Numbers.......................................................................................197Lesson 9 Greatest and Least...........................................................................................199Lesson 10 Counting to 1,000 by Ones.............................................................................201Lesson 11 Practice: Counting to 1,000 ...........................................................................203Lesson 12 Counting to the Next Hundred......................................................................205Lesson 13 Skip-Count by 100s..........................................................................................207Lesson 14 100 More, 100 Less...........................................................................................209Lesson 15 Skip-Count by Tens..........................................................................................211Lesson 16 10 More, 10 Less...............................................................................................213Lesson 17 Skip-Count by Fives.........................................................................................215Lesson 18 Counting a Collection of Coins......................................................................217Lesson 19 Making Equal Collections of Coins...............................................................219Lesson 20 End-of-Chapter Review...................................................................................221Lesson 21 Cumulative Review..........................................................................................223 vi

7Chapter A ddition and Subtraction with Three-Digit Numbers Chapte r 7 O pener ......... .......... .......... ........... .......... .......... .......... .......... .......... ......................225Lesson 1 Addition with Three-Digit Numbers ........................................................... 227Lesson 2 Drawing to Add................................................................................................229Lesson 3 3-Digit Addition: Regrouping Ones .............................................................231Lesson 4 Adding Tens: Sums Above 100......................................................................233 Lesson 5 3-Digit Addition: Regrouping Tens...............................................................235Lesson 6 3-Digit Addition: Regrouping Tens and Ones.............................................237Lesson 7 Practice: 3-Digit Addition...............................................................................239Lesson 8 Adding Four 2-Digit Numbers.......................................................................241Lesson 9 Subtraction with Three-Digit Numbers ......................................................243Lesson 10 Drawing to Subtract .......................................................................................245Lesson 11 3-Digit Subtraction: Regrouping Tens .........................................................247Lesson 12 Subtracting from 100 .....................................................................................249Lesson 13 3-Digit Subtraction: Regrouping Hundreds................................................251Lesson 14 3-Digit Subtraction: Regrouping Tens and Hundreds...............................253Lesson 15 3-Digit Subtraction: Regrouping with 0 in the Tens Place.. ......................255Lesson 16 Practice: 3-Digit Subtraction..........................................................................257Lesson 17 End-of-Chapter Review...................................................................................259Lesson 18 Cumulative Review..........................................................................................261 vii

8Chapter Measurement Chapter 8 Opener ................................................................................................................263Lesson 1 Measure in Inches........................................................................................... 265Lesson 2 Estimate in Inches ...........................................................................................267Lesson 3 Measure in Feet and Yards .............................................................................269Lesson 4 Estimate in Feet and Yards .............................................................................271 Lesson 5 Measure in Two Ways ......................................................................................273Lesson 6 Measure in Centimeters .................................................................................275Lesson 7 Estimate in Centimeters..................................................................................277Lesson 8 Measure in Meters ...........................................................................................279Lesson 9 Estimate in Meters ......................................................................................... 281Lesson 10 Measure in Two Ways ......................................................................................283 Lesson 11 Subtracting to Compare.................................................................................285Lesson 12 Subtracting Mentally to Compare................................................................287Lesson 13 Problem Solving: Subtracting to Compare.................................................289Lesson 14 End-of-Chapter Review...................................................................................291Lesson 15 Cumulative Review......................................................................................... 293 viii

9Chapter Geometry and Fractions C hapte r 9 O pener ................................................................................................................295Lesson 1 Polygons .......................................................................................................... 297Lesson 2 Halves, Thirds, and Fourths ...........................................................................299Lesson 3 Practice: Halves, Thirds, and Fourths ...........................................................301Lesson 4 Arrays..................................................................................................................303Lesson 5 Partitioning a Rectangle ................................................................................305Lesson 6 Equal Shares Can Look Different...................................................................307Lesson 7 End-of-Chapter Review...................................................................................309 ix

10Chapter Data Displays C hapte r 10 O pene r ....... .......... .......... ........... .......... .......... .......... .......... .......... ......................311Lesson 1 Line Plots .......................................................................................................... 313Lesson 2 Tally Charts........................................................................................................315Lesson 3 Reading Picture Graphs..................................................................................317Lesson 4 Constructing Picture Graphs..........................................................................319 Lesson 5 Reading Bar Graphs.........................................................................................321Lesson 6 Constructing Bar Graphs................................................................................323Lesson 7 Problem Solving: Using Data Displays.........................................................325Lesson 8 End-of-Chapter Review ..................................................................................327Lesson 9 Cumulative Review I........................................................................................329Lesson 10 Cumulative Review II.......................................................................................331 x

1Xxx CHAPTER XxxAddition and Subtraction Through Teen NumbersVOCABULARY 8Whole Sum 3 5Part Difference Part Unknown 5 Number 8 - 3Whole Part Break-apart numbers 10 – 7 = 3 Part82+ 6 =4 14 13 – 8 =to make tenthe rest5Chapter 2 Lesson 1 CCSS1.0A.1 Xxx.

Xxx. w2

Fill in the addition number sentence. Addition Through Ten 1. 2. 3. == = 8. 7Add. Circle the doubles facts. +24. 6 5. 7 6. 4 7. 5 +2 +3 +2 +49. 5 10. 3 11. 6 12. 4 13. 6 +5 +3 +4 +3 +314. 4 15. 7 16. 5 17. 2 18. 9 +4 +0 +3 +2 +1Chapter 1 Lesson 1 OA.2 3

Write the number sentence and solve. 1. Tamara has 5 fuzzy stickers. She gets 2 shiny stickers as a reward. How many stickers does she have in all?Number sentence:Tamara has stickers in all.2. For snack, Benny has 6 slices of apple and 3 slices of banana. How many slices of fruit does Benny have?Number sentence:Benny has slices of fruit.3. 8 cats sit near a tree. 2 more cats come to sit there. How many cats are sitting near the tree?Number sentence:There are cats sitting near the tree.4. Mike has 4 goldfish. Bill has 3 more goldfish than Mike has. How many goldfish does Bill have?Number sentence: Bill has goldfish.4

Practice: Addition Through TenDraw a line to the crayon that shows When we add, we think ofthe matching number sentence. the greater number first!Fill in the sums.1. 3 + 7 = 6+2=2. 2 + 6 = 5+3=3. 3 + 4 = 7+3=4. 3 + 5 = 4+3=Add. 8. 4 + 5 =5. 1 + 4 =6. 2 + 4 = 9. 3 + 5 = 7. 3 + 4 = 10. 1 + 5 =11. 4 + 6 = 14. 2 + 7 =12. 2 + 6 = 15. 3 + 7 =13. 3 + 6 = 16. 1+7=Chapter 1 Lesson 2 OA.2 5

There are different ways to make a sum of ten.Fill in the missing addend to complete the number sentence. 1. 8 + = 10 2. 5 + = 10 3. 7 + = 10 4. 10 + = 10 5. 6 + = 10 6. 9 + = 10Add. Think of the greater addend first. 7. 3 + 5 = 8. 2+4= 9. 4 + 5 = 10. 0 + 7 = 11. 6+3= 12. 3 + 7 = 13. 3 + 4 = 14. 1+6= 15. 2 + 5 = 16. 6 + 4 = 2+7= 18. 2 + 6 = 17.LET’S WRITE!How does knowing how to solve 7 + 3 help you solve 3 + 7?6

When we subtract a little, Subtraction Through Ten we cross off the dots from the top as we count back. 10 – 2 = 8We cross off the 10 and 9.There are 8 left.Cross off the dots you need to subtract. 4.Write the difference.1. 2. 3. 6–2= 9–3= 9–4= 8–3=5. 6. 7. 8.5–2= 10 – 3 = 10 – 4 = 7–2=Subtract. 10. 11. 12. 9. 6–1= 7–3= 9–2= 10 – 2 = 16.13. 14. 15. 7–1= 5–1= 8–2= 4–0=Chapter 1 Lesson 3 OA.2 7

When we subtract a lot, we cross off 10 – 7 = 3 the dots from the bottom and count 4. on to see how much is left.We cross off 7. We are left with 8, 9, and 10.There are 3 left.Cross off the dots you need to subtract.Write the difference. 1. 2. 3.9–7= 10 – 6 = 6–5= 8–6=5. 6. 7. 8. 7–4= 9–5= 9–6= 10 – 9 =Subtract. 10. 11. 12. 9. 8–7= 6–4= 9–8= 10 – 5 = 14. 15. 16.13. 4–3= 10 – 8 = 8–4= 5–5=8

Practice: Subtraction Through TenDecide if you are subtracting a lot or a little. 4.Cross off the dots you need to subtract.Write the difference. 1. 2. 3. 9–7= 9–3= 8–2= 8–5=5. 6. 7. 8.10 – 4 = 10 – 8 = 8–7= 8–3=9. 10. 11. 12. 9–6= 9–4= 7–6= 7–2=13. 14. 15. 16.8–1= 8–6= 5–4= 5–2=Chapter 1 Lesson 4 OA.2 9

Subtract. 2. 7 3. 6 4. 9 5. 10 6. 4 –5 –2 –8 –3 –0 1. 10 –67. 5 8. 9 9. 6 10. 8 11. 7 12. 4 –4 –3 –3 –5 –3 –213. 10 14. 8 15. 7 16. 6 17. 9 18. 8 –5 –4 –4 –6 – 5 –6Write the number sentence, and solve.19. Nan has 10 markers. Lizzy has 3 fewer markers than Nan has. How many markers does Lizzy have? Number sentence: Lizzy has markers. LET’S WRITE! Look at exercise 18. Explain how you solved 8 – 6.10

Number Families The numbers in a math puzzle are a family. When we add, we begin with a part. When we subtract, we begin with the whole.Complete each math puzzle.Write four number sentences for each math puzzle.1. 2. Whole Whole Part Part Part Part + = += Part Part Whole Part Part Whole + = += Part Part Whole Part Part Whole – = –= Whole Part Part Whole Part Part – = –= Whole Part Part Whole Part Part3. 4. Whole Whole Part Part Part Part += += Part Part Whole Part Part Whole += += Part Part Whole Part Part Whole –= –= Whole Part Part Whole Part Part –= –= Whole Part Part Whole Part PartChapter 1 Lesson 5 OA.2 11

Fill in the numbers in the math puzzle. Write two number sentencesfor each math puzzle.1. 2 4 6 2. 6 8 2 3. 9 4 5 Whole Whole Whole Part Part Part Part Part Part += += +=Part Part Whole Part Part Whole Part Part Whole –= –= –=Whole Part Part Whole Part Part Whole Part Part4. 8 3 5 5. 4 10 6 6. 5 2 3 Whole Whole Whole Part Part Part Part Part Part += += +=Part Part Whole Part Part Whole Part Part WholeWhole –= Part Whole –= Part Whole –= Part Part Part PartLET’S WRITE!Look at exercise 6. How did you decide which number was the wholeand which numbers were the parts? 12

Problem Solving: Both Addends UnknownCircle the number sentence that shows the correct addends.Complete the math puzzle.1. Brian has 10 marbles. 10 Some are red and some are blue. Whole10 = 6 + 4 10 = 6 + 3 Part Part2. Megan has 7 rocks. 7 Some are big and some are small. Whole7 = 3 + 3 7=4+3 Part Part3. Tami has 6 pens. 6 Some are blue and some are black. Whole6 = 4 + 2 6=5+2 Part Part4. A store sold 9 stuffed animals. 9 Some were bears and some were lions. Whole9 = 7 + 2 9=7+3 Part PartChapter 1 Lesson 6 OA.1 13

Write more than one possible pair of addends. 8Fill in the math puzzles for each story problem. Whole 1. Melissa has 8 pieces of fruit. Some are grapes and some are cherries. 8 Whole Part Part Part Part8= + 8 = +2. John has 5 apples. 5 Some are red and some are green. Whole 5 Whole Part Part Part Part5= + 5 = +3. Hong took 7 photos yesterday. Some are of family and some are of friends. In what ways could Hong have split the photos? 7 7 7 Whole Whole Whole Part Part Part Part Part Part 7= + 7= + 7= +14

Finding the Unknown Number We can use a to represent the unknown number. When we know both parts, When we know the whole andwe add them together to find one part, we subtract to find the whole. the other part. Whole 8 35 Whole Part Part 3 Part Part = Whole = Part Part Whole Part PartWrite the number sentence to find the unknown number.1. 2. 3. 7 Whole 9 Whole 64 Whole 4 Part Part 2 Part Part Part PartWhole = Part = Whole = Part Part Part Whole Part PartChapter 1 Lesson 7 OA.2 15

Write the number sentence to find the unknown number.1. 2. 3. 10 Whole 8 Whole 25 Whole 7 Part Part 4 Part Part Part PartWhole = Part = Whole =4. Part Part 5. Part Whole 6. Part Part 9 6 Whole Whole Whole 46 3 1 Part Part Part Part Part PartWhole = Whole = Part =7. Part Part 8. Part Part 9. Part Whole Whole 6 8 45 Whole Whole Part Part 4 6 Part Part Part Part Part = Whole = Whole =16 Part Whole Part Part Part Part

Finding the Unknown Number in Story ProblemsElla has 9 T-shirts. We can use a to5 T-shirts are colored. The rest are white. represent the unknownHow many T-shirts are white? number. –=Whole Part Part Whole –= Part Part PartWhole PartT-shirts are white.Fill in the math puzzle and write the number sentence.Use a for the unknown number. Solve.1. Natalie has 10 postcards. 7 postcards are from her grandparents. The rest are from her aunt. How many postcards are from Who le Natalie’s aunt?Number sentence: Part PartNatalie has ______ postcards from her aunt.2. Jeremy has 8 pink balloons Whole and 2 blue balloons. Part Part How many balloons does Jeremy have in all? Number sentence: Jeremy has _______ balloons in all.Chapter 1 Lesson 8 OA.1 17

Fill in the math puzzle and write the number sentence. WholeUse a for the unknown number. Solve.1. There are 9 birds in a tree. 4 of the birds are blue. How many of the birds are a different color? Number sentence: Part Part of the birds are a different color. Whole2. Kevin has 5 books in a box. 3 books are hardcover. The rest are paperback. How many paperback books are in the box?Number sentence: Part PartKevin has paperback books in the box.3. Carmella has 3 shiny stickers Whole and 6 fuzzy stickers. How many stickers does she have in all?Number sentence: Part PartShe has stickers in all. Whole Part Part4. Rosa listened to 8 songs. She did not like 3 of the songs. She liked the rest of them. How many of the songs did Rosa like?Number sentence:Rosa liked of the songs.18

Adding to Teen Numbers Add. 2. 3. 4. 5. 6. 1. 11 4 14 2 12 +5 +3 +3 +7 +7 1 +57. 8. 9. 10. 11. 12. 3 13 1 11 3 13 +5 +5 +6 +6 +3 +3Write the number sentence that will help solvethe exercise. Solve.13. 14. 12 + 6 = 11 + 8 = += +=15. 16. 11 + 7 = 13 + 6 = + = + =17. 18. 12 + 5 = 14 + 4 = += +=Chapter 1 Lesson 9 OA.2 19

Add.1. 2. 3. 4. 14 + 3 = ___ 10 + 6 = ___ 15 + 4 =___ 17 + 2 =___5. 6. 7. 8. 13 + 5 = ___ 12 + 4 = ___ 11 + 8 = ___ 12 + 6 = ___9. 10. 11. 12. 10 + 9 = ___ 13 + 4 = ___ 14 + 5 = ___ 16 + 3 = ___13. 14. 15. 16. 12 + 2 = ___ 11 + 4 = ___ 13 + 6 = ___ 14 + 4 = ___Fill in the math puzzle and write the number sentence. WholeUse a for the unknown number. Solve.17. Rafael has 10 carrot sticks. He has 5 celery sticks. How many vegetable sticks does Rafael have?Number sentence: Part Part WholeRafael has vegetable sticks.18. Kelli has 10 bananas. She buys 4 oranges. How many pieces of fruit does Kelli have? Number sentence: Part Part Kelli has _______ pieces of fruit.20

Adding in Two Steps When the sum will be more than 10, we add in two steps: First we add to make a ten. Then we add the rest to the ten to get the sum.28 + 6 = 144 We break apart the 6.to make ten the rest 2 and 4 are the break-apart numbers. Color the dots and draw an arrow to make a ten. 3. Fill in the break-apart numbers and write the sum.1. 2.9 + 9 = 8+7= 9+6= to make ten the rest to make ten the rest to make ten the rest4. 5. 6.7+6= 8+5= 6+6= to make ten the rest to make ten the rest to make ten the restChapter 1 Lesson 10 OA.2 21

Color the dots and draw an arrow to make a ten.Fill in the break-apart numbers and write the sum. 1. 2. 3. 9+8= 7+5= 7+7=to make ten the rest to make ten the rest to make ten the rest4. 5. 6. 6+5= 8+8= 7+4=to make ten the rest to make ten the rest to make ten the restFill in the math puzzle and write the number sentence.Use a for the unknown number. Solve.7. Bob has 8 picture books. Whole He also has 8 storybooks. How many book does Bob have in all? Number sentence: _______________ Part Part Bob has ___ books in all.22

Practice: Addition with Teen SumsColor the dots and draw an arrow to make a ten.Fill in the break-apart numbers and write the sum. 1. 2. 3.9+9= 8+5= 9+6=to make ten the rest to make ten the rest to make ten the restAdd.Remember: We can think of the greater number first.4. 7. 10. 6+9= 3+8= 7+9=5. 5 + 9 = 8. 6 + 8 = 11. 8 + 9 =6. 9. 12. 3+9= 7+8= 4+9=13. 5 + 7 = 16. 4 + 6 = 19. 5 + 8 =14. 6 + 7 = 17. 6 + 6 = 20. 4 + 8 =15. 18. 21. 4+7= 5+6= 8+8=Chapter 1 Lesson 11 OA.2 23

Circle each number sentence whose sumis more than ten. Add. 1. 6 2. 6 3. 8 4. 8 5. 9 6. 7 +3 +5 +1 +4 +9 +27. 8 8. 6 9 7 10. 4 11. 9 12. 6 +9 +4 +5 +4 +7 +913. 7 14. 9 15. 8 16. 6 17. 4 18. 8 +3 +5 +6 +2 +7 +7LET’S WRITE!Look at exercise 18. Explain how you solved 8 + 7.24

Using the Number Line to Add We make two jumps on the number line: First we jump to the ten. Then we jump the rest. +68+6= 8Color the dots and draw an arrow to make a ten.Complete the number line. Fill in the sum. 1. +7 9+7= 9 +52. 8+5= 8 +63. 9+6= 9 +74.7+7= 7Chapter 1 Lesson 12 OA.2 25

Color the dots and draw an arrow to make a ten.Complete the number line. Fill in the sum.1. + 5 6+5= 6 +52. 7+5= 7 3. +8 8 8+8=ON YOUR OWN! 4. 8+7=Add. 6. 8 7. 6 8. 2 9. 7 10. 4 +5 +6 +9 +7 +8 5. 9 +826

Choosing a Strategy to Add Add. Which way works best for you? 7+6= I like to use the I like to break-apart use the number sentence. Dot Card. 7 + 6 = 13 33 to make ten the rest I like to use the number line. +6 +3 13 +3 10 7Circle the way that works best for you. Solve.1. 8 + 6 = 2. 7+5= 8+6= 7+5= to make ten the rest to make ten the rest+6 +587Chapter 1 Lesson 13 OA.2 27

Add. Choose the way that works best for you. Solve.1. 9 + 7 = 2. 6 + 6 = 9+7= 6+6= to make ten the rest to make ten the rest +7 +6 9 6Add. 4. 4 5. 7 6. 6 7. 7 8. 3 +7 +6 +5 +7 +83. 9 +8Write the number sentence and solve.9. Pat had 8¢. ¢ Her dad gave her another 5¢. How much money does she have now?Number sentence: 28

Adding with Three AddendsThese are Team A’s points. I first added to Add to find the total. make a ten. 473 4+ 7 + 43S=u=z1y414points + I added 10 the numbers in order. I first added to make a 4 + 7 + 3B=ella14 points doubles fact. 11 + 3 = 14 4+ 7+ 3K=el1ly4 points + 7 = 14 7We can add in any order and get the same sum.Circle the addends you will add first.Add. Then add the rest.Then solve again, adding in a different order.1. 8 + 7 + 2 = 8+7+2=+= +=2. 7 + 4 + 5 = 7+4+5= += +=3. 1 + 8 + 9 = 1+8+9= += +=Chapter 1 Lesson 14 OA.2 29

Circle the addends you will add first.Add. Then add the rest.1. 6 + 5 + 4 = 2. 8 + 6 + 3 = += += 4. 7 + 5 + 1 =3. 7 + 9 + 2 = += += 6. 3 + 6 + 6 = +=5. 8 + 5 + 6 = 8. 7 + 6 + 2 = + =Add.7. 5 + 3 + 4 =9. 5 + 8 + 5 = 10. 4 + 8 + 5 =11. 8 + 3 + 8 = 12. 9 + 6 + 2 =13. 1 + 7 + 6 = 14. 6 + 4 + 9 =Write the number sentence. Solve.15. Judy has 8 red buttons, 4 green buttons, and 3 purple buttons. How many buttons does Judy have? + += Judy has buttons.30

Subtracting from Teen NumbersSubtract.1. 8 2. 18 3. 6 4. 16 5. 7 6. 17–4 – 4 –5 – 5 –3 – 37. 9 8. 19 9. 4 10. 14 11. 5 12. 15–4 – 4 –3 – 3 –4 – 4Write the number sentence that will help you solve the exercise.Solve.13. 18 – 6 = 14. 17 – 4 = –= –=15. 19 – 5 = 16. 18 – 5 = –= –=17. 19 – 7 = 18. 17 – 6 = –= –=Chapter 1 Lesson 15 OA2 31

Subtract. 2. 3. 4. 1. 19 – 6 = 18 – 7 = 17 – 2 =15 – 3 = 5. 6. 7. 8.16 – 5 = 17 – 4 = 19 – 8 = 18 – 6 = 9. 10. 11. 12.15 – 5 = 16 – 4 = 18 – 5 = 19 – 3 =13. 14. 15. 16.14 – 2 = 19 – 4 = 17 – 5 = 16 – 1 =Fill in the math puzzle and write the number sentence. WholeUse a for the unknown number. Solve.17. Boris has 18 yo-yos. 4 yo-yos are glow-in-the-dark. The rest are not glow-in-the-dark. How many yo-yos are not glow-in-the-dark?Number sentence: Part yo-yos are not glow-in-the-dark. Part18. There are 15 children in the yard. Whole 4 are playing with sidewalk chalk. Part Part The rest are playing jump rope. How many children are playing jump rope? Number sentence: children are playing jump rope.32

Subtracting in Two StXepxsx155 – 6 = 19 When we subtract more than the onesto get to ten the rest that we have, we subtract in two steps. First we subtract all the ones and get to ten. Then we subtract the rest from the ten to find the difference. We break apart the 6. 5 and 1 are the break-apart numbers.Cross off the dots you need to subtract.Fill in the break-apart numbers and write the difference. 1. 2. 3.15 – 7 = 14 – 5 = 11 – 4 = to get to ten the rest to get to ten the rest to get to ten the rest4. 5. 6.12 – 4 = 11 – 5 = 12 – 5 =to get to ten the rest to get to ten the rest to get to ten the restChapter 1 Lesson 16 OA.2 33

Cross off the dots you need to subtract.Fill in the break-apart numbers and write the difference. 1. 2. 3.16 – 7 = 14 – 6 = 13 – 4 = to get to ten the rest to get to ten the rest to get to ten the rest4. 5. 6.13 – 5 = 15 – 6 = 13 – 6 =to get to ten the rest to get to ten the rest to get to ten the restFill in the math puzzle and write the number sentence.Use a for the unknown number. Solve.7. There were 16 apples in a basket. Whole 7 apples were sold. How many apples are in the basket now? Number sentence: Part Part There are ______ apples are in the basket.34

Practice: Subtracting in Two Steps Cross off the dots you need to subtract. Fill in the break-apart numbers and write the difference. 1. 2. 3.14 – 6 = 12 – 5 = 13 – 6 = to get to ten the rest to get to ten the rest to get to ten the rest4. 5. 6.13 – 5 = 15 – 6 = 11 – 4 =to get to ten the rest to get to ten the rest to get to ten the restLET’S WRITE!Look at exercise 1. Explain how you solved 14 – 6.___________________________________________________________________________________________________________________________________________________________________________Chapter 1 Lesson 17 OA.2 35

Subtract. 3. 12 – 2 = 4. 12 – 4 = 1. 14 – 4 = 2. 14 – 5 = 7. 13 – 3 = 8. 13 – 5 = 5. 15 – 5 = 6. 15 – 6 =Subtract. 10. 11. 12. 13. 14. 9. 17 15 15 13 13 17 –8 –5 –7 –3 –4 –715. 16. 17. 18. 19. 20. 16 16 14 14 12 12 –6 –7 –4 –6 –2 –3Practice. 22. 23. 24. 25. 21. 13 12 12 19 11 –6 –5 –6 –9 –536

Using the Number Line to Subtract We make 2 jumps back. First we jump back to the ten. Then we jump back the rest.15 – 7 = –7 15Cross off the dots you need to subtract.Complete the number line. Write the difference. –51. 12 – 5 = 122. –6 14 – 6 = 14 –73. 16 – 7 = 16 –54.Chapter 1 14 – 5 = 14 Lesson 18 OA.2 37

Cross off the dots you need to subtract. –6Complete the number line. Write the difference. 15 1. –4 15 – 6 = 12 2. –6 12 12 – 4 = 3. 12 – 6 =ON YOUR OWN! 4. 13 – 6 = 7. 12 8. 12 9. 11 10. 13 –5 –3 –4 –4Subtract.5. 14 6. 13 –6 –538