Grade 2 Student Edition

Write the time. 2. End-of-Chapter Review1. 3. : :: o’clock minutes after a quarter 114. 5. 6. : : : half past minutes after minutes after 8. 9.7. :: : a quarter 7 o’clock minutes afterChapter 4 Lesson 8 139

Draw the hands to show the time. 3.1. 2. five fifteen seven forty nine fifty-five4. 5. 6. 3:35 11::10 10::50Write the time. Time Now 30 Minutes After 30 Minutes Before :7. 7:00: am 7:00: am 7:00 am8. 7:00 pm 7:0:0 amCircle the time that makes sense. 9. The time you brush your teeth in the morning 140

Write the value of each group of coins. Cumulative Review 1. 2. ¢ ¢ ¢ 3. 4. ¢ ¢ ¢Write the value of each group of coins.Compare. Write >, <, or =. 5. ¢ 6. ¢Circle the coins needed to pay for the item. 7. 40¢ 8. 141 50¢ 9. 38¢Chapter 4 Lesson 9

Complete the number line. Fill in the sum. +61. 57 + 6 = 57 2. 68 + 20 = 3. 68 + 22 = 68 +22Add. 68 4. 5. 6. 56 +35 48 67 +26 +15Reorder and add to find the sum.7. 27 + 18 + 23 8. 21 + 36 + 34Reorder: + Reorder: + + + + ++ +142

5Xxx CHAPTER Xxx Subtraction withTwo-Digit Numbers SSotWSel5vtpree6it.p2e:-1t5h: e62n0um-be4rVOCABULARY sentence. – 20 Regrouping = Difference 36 36Two-Step Story Problems –4Story Problems with Change 32 Unknown –6 -2 54 48 50 -4 54 –6 48 Tens Ones – 3 12 4 2 1 3 29Chapter 2 Lesson CCSS1.0A.1 Xxx. 1

Xxx. w2

Subtracting Ones from Two-Digit NumbXexrxs We can subtract ones from a two-digit number. 27 – 3 = 24Write the number sentence. 2.1.–= –=3. 4.–= –= 46 – 5 =Cross off to subtract. Write the difference.5. 6. 58 – 3 =Chapter 5 Lesson 1 145

Subtract. 67 2. 3. 48 1. –5 –4 9 39 8 7 –6 – 6 –4 –54. 8 4 5. 9 8 6. 5 8 7. 8 4 8. 2 7 –2 –3 –6 –4 –19. 10. 11. 12. 13. 56 47 38 77 89 –5 –2 –6 –6 –7Fill in the math puzzle and write the number sentence.Use a for the unknown number. Solve.14. Paul and Bill went fishing. Whole Together they caught 19 fish. Part Part Paul caught 8 of them. How many fish did Bill catch?Number sentence:Bill caught fish.146

Subtracting Tens from Two-Digit Numbers When we subtract tens, the number of ones does not change. 45 – 20 = 25Write the number sentence. 2.1.–= –= 56 – 40 =Cross off to subtract. Write the difference.3. 47 – 20 = 4.5. 45 – 30 = 6. 35 – 10 =Chapter 5 Lesson 2 147

Subtract.1. 6 8 2. 5 4 3. 7 1 4. 8 7 5. 9 6 –3 0 –2 0 – 2 0 –1 0 –3 06. 7 2 7. 6 6 8. 9 1 9. 5 7 10. 8 9 –4 0 – 5 0 –4 0 – 3 0 – 6 011. 4 8 12. 9 3 13. 8 4 14. 7 6 15. 7 3 – 3 0 –7 0 –5 0 –2 0 –5 0Fill in the math puzzle and write the number sentence.Use a for the unknown number. Solve.16. Mark has 18 fish in his fish tank. Whole 10 of them are orange and the rest of them are gray. How many gray fish are there in Mark’s fish tank?Number sentence: Part PartThere are gray fish in his tank.148

Two-Step Story Problems, Subtracting TwiceWrite a number sentence and solve.Use a for the unknown number.1. There are 56 markers in a bin. Step 1. Group A takes 20 markers. Write the number sentence. Group B takes 4 markers.How many markers are left in Step 2.the bin? Solve.There are markers left in – –the bin.2. Maddie had 48 stickers. She Step 1.gave 30 stickers to her sister and Write the number sentence.5 stickers to her cousin.How many stickers does Maddie Step 2.have left? Solve.Maddie has stickers left. – –3. Eduardo had 85¢. He bought Step 1. a pencil for 40¢, and he Write the number sentence. paid 4¢ tax. How much money does Step 2. – Eduardo have left? Solve. Eduardo has ¢ left. –Chapter 5 Lesson 3 149

Write a number sentence and solve. Use a for the unknown number.1. Ms. Jensen has $78. She bought Step 1. 4 tickets to Adventure World for Write the number sentence. $50, and she paid another $6 for games.How much money does Ms. Step 2.Jensen have left? Solve.Ms. Jensen has $ left. – –2. There were 64 water bottles in a Step 1.cooler. The first group of guests Write the number sentence.took 20 water bottles. Then Jefftook 2 more water bottles. Step 2.How many water bottles are left Solve.in the cooler?There are water bottles left – –in the cooler.3. Olivia has 56 pages to read. She Step 1. read 30 pages in the morning. Write the number sentence. She read 5 more pages in the afternoon.How many pages does Olivia Step 2.still have to read? Solve.Olivia has pages left – –to read.150

Subtracting Two-Digit NumbersWe can subtract two-digit numbers.First subtract the ones. Tens Ones Then subtract the tens. 47 –2 3 24There are 4 ones left. There are 2 tens left.Cross off to subtract. Write the difference.1. 2. Tens Ones Tens Ones 36 57 –1 5 –2 23. 4. Tens Ones Tens Ones 56 –3 4 45 –3 1Chapter 5 Lesson 4 151

Subtract. 2. Tens Ones 3. Tens Ones 4. Tens Ones 1. Tens Ones 67 76 89 –3 6 –2 4 –4 8 46 –2 25. Tens Ones 6. Tens Ones 7. Tens Ones 8. Tens Ones 58 87 65 97 –3 6 –5 3 –2 3 –5 39. Tens Ones 10. Tens Ones 11. Tens Ones 12. Tens Ones 74 96 88 69 –3 1 –6 6 –3 4 –4 2Write a number sentence and solve. Use a for the unknown number.13. Mr. Peters has $75. He buys a Step 1. book for $30 and a pen for $4. Write the number sentence.How much money does Step 2.Mr. Peters have left? Solve.Mr. Peters has $ left. _ _152

Regrouping with Dot CardsSometimes we do not have enough ones to subtract. Then:1. R egroup. Move over a ten to the ones place to form a teen number. Write the new numbers. 2. S ubtract the ones.3. S ubtract the tens. Tens Ones 3 l2 42 –1 3Regroup a ten to form a teen number. Write the new numbers.Cross off to subtract the ones. Cross off to subtract the tens.Write the difference.1. 2. Tens OnesTens Ones 36 22–2 8 –1 33. 4.Tens Ones Tens Ones 45 47–2 7 –1 9Chapter 5 Lesson 5 Regrouping with Dot Cards 153

Regroup a ten to form a teen number. Write the new numbers. Tens OnesCross off to subtract the ones. Cross off to subtract the tens.Write the difference.1. Tens Ones 2. 43 44 –3 5 –1 83. Tens Ones 4. Tens Ones 32 46 –1 7 –2 95. Tens Ones 6. Tens Ones 41 33 –2 7 –2 9Write a number sentence and solve. Use a for the unknown number. 7. Rajiv had $48. He buys a pair of Step 1. pants for $20 and a belt for $8. Write the number sentence.How much money does Rajiv Step 2.have left? Solve.Rajiv has $ left. – –154

Practice: Regrouping with Dot CardsWhen we regroup, we can write in a 1 next tothe ones to form a teen number. Tens Ones 4 514 –3 6Regroup a ten to form a teen number. Write the new numbers.Cross off to subtract the ones. Cross off to subtract the tens.Write the difference.1. 2. Tens Ones Tens Ones 46 38 –2 9 –1 93. 4. Tens Ones Tens Ones 42 43 –2 4 –1 6Chapter 5 Lesson 6 155

Regroup a ten to form a teen number. Write the new numbers. Cross offto subtract the ones. Cross off to subtract the tens. Write the difference.1. 2.Tens Ones Tens Ones 42 45–2 5 –1 83. 4. Tens OnesTens Ones 34 44–1 5 –2 85. 6. Tens Ones Tens Ones 31 –1 6 41 –1 9 Tens Ones7. 72 –1 6 156

Regrouping in ColumnsWhen we subtract more than the ones that there are, we regroup to form a teen number.Regroup and subtract. 2. Tens Ones 3. 1. 65 Tens Ones –4 8 Tens Ones 57 –2 8 6 73 –3 54. 5. 6. Tens Ones Tens Ones Tens Ones 61 84 92 –3 4 –5 8 –4 77. 8. 9. Tens Ones Tens Ones Tens Ones 71 53 62 –3 8 –1 4 –3 710. 11. 12. Tens Ones Tens Ones Tens Ones 82 98 74 –4 5 –6 9 –2 9Chapter 5 Lesson 7 157

Regroup and subtract.1. 2. 3. 4. Tens Ones Tens Ones Tens Ones Tens Ones 46 62 81 74 –2 7 –3 6 –4 3 –4 85. 6. 7. 8. 9 5 –5 8 53 43 64 –1 6 –3 7 –3 59. 10. 7 7 11. 12. 6 1 –4 9 –4 6 93 53 –4 7 –2 413. 14. 15. 16. 85 96 73 87 –4 9 –5 7 –2 4 –7 9LET’S WRITE!Look at exercise 16. Are there any tens in your answer?Explain why or why not.158

Two-Step Story Problems, Adding and SubtractingWrite a number sentence and solve. Use a for the unknown number.1. There are 25 thick markers and Step 1. 20 thin markers in the bin. Billy Write the number sentence. takes 2 markers from the bin. How many markers are left in Step 2. the bin? Solve. There are markers in the bin.2. There are 36 eggs in cartons Step 1. and 12 eggs in a bowl. Tami Write the number sentence. takes 3 eggs. Step 2. Solve. How many eggs are left? There are eggs left.3. Paul has $42. He spends $20. Step 1. Later, his father gives him $10. Write the number sentence. Step 2. How much money does Paul Solve. have now? Paul has $ .Chapter 5 Lesson 8 159

Write a number sentence and solve. Use a for the unknown number.1. Jill has 10 peas on her plate. Step 1.She eats 4 peas. Then she puts 5 Write the number sentence.more peas on her plate.How many peas are on Jill’s Step 2.plate now? Solve.There are peas onJill’s plate.2. Pete has $35. He spends $10. Step 1.Later, his mother gives him $25. Write the number sentence.How much money does Pete Step 2.have now? Solve.Pete has $ .3. There are 36 people on a bus. Step 1.At the first stop, 10 more people Write the number sentence.get on the bus. At the secondstop, 20 people get off the bus.How many people are still on Step 2.the bus after the second stop? Solve.There are people still onthe bus after the second stop.160

Mixed Practice: Subtracting in ColumnsP 54 P 67O –2 8 O –3 4 Sometimes we need to Sometimes we haveregroup to have enough ones enough to subtract without regrouping. from which to subtract.Do we have to regroup? Circle the correct sign. 3.Subtract. 1. 2. P 58 O –2 7P 61 P 84O –3 6 O –4 74. 5. 6. P 96 P 72 P 66 O –4 6 O –2 8 O –4 27. 8. 9. P 82 P 87 P 73 O –5 7 O –5 3 O –4 5Chapter 5 Lesson 9 161

Do we have to regroup? Circle the correct sign.Subtract.1. 2. 3. 4.P 74 P 62 P 91 P 68O –3 3 O –37 O –54 O –265. 6. 7. 8. P 84 P 43 P 72 P 43 O –56 O –23 O –26 O –189. 10. 11. 12. P 65 P 76 P 87 P 91 O –29 O –25 O –64 O –56Write a number sentence and solve. Use a for the unknown number.13. Sam is putting books in boxes. Step 1. There were 25 books on shelves Write the number sentence. and 14 books on the floor. Step 2. Sam has already put 8 of the Solve. books into a box. How many books does Sam have left to box?Sam has books left to box.162

Subtracting Ones from a Decade NumberWe can use a number line to subtract. 40 –2–2 38 40 38Cross off the dots you need to subtract. 30Complete the number line. Write the difference. 40 1. 40 30 –1 2. 40 –3 3. 40 –5Chapter 5 Lesson 10 163

Circle to show in which tens number the difference will be. 30Complete the number line. Write the difference. 1. 30 – 2 = 10s 20s 30s2. 60 80 60 – 4 = 50s 60s 70s 60 903. 80 – 5 = 60s 70s 80sComplete the number line. Write the difference.4. 7 0 5. 6 0 –1 –2 706. 8 0 7. 9 0 –3 –5 808. 5 0 9. ON YOUR OWN! –4 40 50 – 5164

Subtracting Ones from a Two-Digit NumberWhen we subtract more than the ones that there are,we make two jumps.First we jump back to get to a tens number.Then we jump back the rest. 54 –6–6 –2 –4 54 48 48 50Complete the number line. Write the difference. –4 1. 63 63 –42. –7 34 34–7 –83. 96 96–8Chapter 5 Lesson 11 165

Complete the number line. Write the difference. –51. 4 3 43 –5 –62. 8 5 –6 853. 7 3 –6 –6 734. 9 4 –7 –75. 6 2 94 –6 –66. 5 1 –4 627. 3 4 –4 –5 51 166 –5 34

Practice: Using the Number Line to SubtractComplete the number line. Write the difference.1. 6 0 2. 6 2 –3 –5 –3 –53. 9 0 60 4. 9 3 62 –2 –5 –2 –5 90 935. 4 0 6. 4 1 –4 –5 –4 –57. 7 0 40 41 –1 8. 7 3 –4 –4 –1 70 73Chapter 5 Lesson 12 167

Complete the number line. Write the difference. –5 80 –3 901. 8 0 –6 74 –5 –5 53 402. 9 0 –6 83 –3 –73. 7 4 –64. 5 3 –55. 4 0 –66. 8 3 –77. ON YOUR OWN! 3 4 –5168

Choosing a StrategySubtract: 60 – 3 =Which way works best for you?I like to use I like to usea number columns.line. –3 5 57 60 610Choose the way that works best for you. Subtract. –3 1. 57 56 – 7 = –2. 76 – 18 = – 3. – 40 – 3 = 169Chapter 5 Lesson 13

Choose the way that works best for you. –Subtract. – 1. – – 95 – 6 = 2. 80 – 5 = 3. 30 – 8 = 4. 63 – 27 = 170

Story Problems with Change UnknoXwxnxWe can use four steps to solve story problems.There were 7 tennis balls in Step 1. Write a number sentence.Simon’s bag. He put somemore tennis balls in his bag. 7 + = 12Now there are 12 tennis ballsin the bag. Step 2. Fill in the math puzzle.How many tennis balls did 12Simon put in his bag? WholeSimon put tennis balls in 7 Parthis bag. Part Step 3. Solve. 12 – 7 = 5 Step 4. Check your answer. 7 + 5 = 12Use the four steps to solve the story problem.Use a for the unknown number.1. Esty had 4 crayons in a box. Step 1. Write a number sentence. She put some more crayons Step 2. Fill in the math puzzle. in the box. Now there are 12 crayons in the box.How many crayons did Esty Wholeput in the box?Esty put crayons in Part Partthe box. Step 3. Solve. Step 4. Check your answer.Chapter 5 Lesson 14 171

Use the four steps to solve the story problems.Use a for the unknown number.1. There were 13 sheets of Step 1. Write a number sentence. paper in a printer. Cal took Step 2. Fill in the math puzzle. some sheets of paper from the printer. Now there are Whole 10 sheets of paper in the printer.How many sheets of paper Part Partdid Cal take from printer? Step 3. Solve.Cal took sheets ofpaper from the printer. Step 4. Check your answer.2. The Green team had 6 points. Step 1. Write a number sentence. They answered a question correctly. Now they have Step 2. Fill in the math puzzle. 14 points. How many points was Whole the question worth? The question was worth Part Part points. Step 3. Solve. Step 4. Check your answer.172

Story Problems with Start UnknoXwxnxUse the four steps to solve the story problem.Use a for the unknown number.1. There were some paper clips in Step 1. Write a number sentence. a cup. Alicia took 8 paper clips Step 2. Fill in the math puzzle. out of the cup. Now there are 5 paper clips in the cup.How many paper clips were in Wholethe cup at first? paper clips were in the Part Partcup at first. Step 3. Solve. Step 4. Check your answer.2. Zoe used some links to make Step 1. Write a number sentence. a chain. Then she added 5 more links. Step 2. Fill in the math puzzle. Now there are 11 links in the chain.How many links were there Wholeat first?There were links. Part Part Step 3. Solve. Step 4. Check your answer.Chapter 5 Lesson 15 173

Use the four steps to solve the story problem.Use a for the unknown number.1. Carl has a box of crayons. He Step 1. Write a number sentence. took 6 crayons out of Step 2. Fill in the math puzzle. the box. There are 9 crayons left in the box.How many crayons were Wholein the box at first? crayons were Part Partin the box. Step 3. Solve. Step 4. Check your answer.2. Asher has a stamp collection. Step 1. Write a number sentence. His dad gave him 2 more stamps. Now he has 12 stamps. Step 2. Fill in the math puzzle.How many stamps did he havebefore? WholeAsher had stampsbefore. Part Part Step 3. Solve. Step 4. Check your answer.174

Practice: Mixed Problem SolvingUse the four steps to solve the story problem.Use a for the unknown number.1. There were some flowers in a Step 1. Write a number sentence. basket. Craig took 27 flowers Step 2. Fill in the math puzzle. and put them in a vase. There are now 12 flowers left in the basket.How many flowers were in the Wholebasket at first?There were flowers in the Part Partbasket at first. Step 3. Solve. Step 4: Check your answer.2. Tommy has a bag of 30 Step 1. Write a number sentence. balloons. His mom gives him some Step 2. Fill in the math puzzle. more balloons. Now Tommy has 40 balloons. Whole How many balloons did Tommy’s mom give him? Part Part Tommy’s mom gave him _____ balloons. Step 3. Solve. Step 4. Check your answer.Chapter 5 Lesson 16 175

Use the four steps to solve the story problem.Use a for the unknown number.1. Celia had a plate of celery Step 1. Write a number sentence. sticks. Step 2. Fill in the math puzzle. She ate 5 celery sticks. Now there are 10 celery sticks on the plate.How many celery sticks were Wholethere at first?There were _____ celery sticks Part Partat first. Step 3. Solve. Step 4. Check your answer.2. Pablo built a tower with Step 1. Write a number sentence. 25 blocks. Some blocks fell off. Step 2. Fill in the math puzzle. Now the tower has 20 blocks. How many blocks fell off the Whole tower? ____ blocks fell of the tower. Part Part Step 3. Solve. Step 4. Check your answer.176

End-of-Chapter ReviewCross off to subtract. Write the difference.1. 2. 47 36 –2 5 –1 3Regroup a ten to form a teen number. Write the new numbers. Cross offto subtract the ones. Cross off to subtract the tens. Write the difference.3. 4. 42 35 –1 6 –1 7Write a number sentence and solve. Use a for the unknown number.5. Jerry has $38. He buys a book Step 1. for $10 and a notebook for $5. Write the number sentence.How much money does Jerry Step 2.have left? Solve.Jerry has $ left.Chapter 5 Lesson 17 177

Do we have to regroup? Circle the correct sign.Subtract.1. 2. 3. 4.P 52 P 64 P 62 P 87O –2 3 O –2 1 O –4 7 O –2 4Circle to show in which tens number the difference will be. 70Complete the number line. Write the difference.5. 7 0 – 4 = 50s 60s 70sComplete the number line. Write the difference. –56. 9 3 93 –5Write a number sentence and solve. Use a for the unknown number.7. Lena has 12 green pencils Step 1. and 15 red pencils. She gives Write the number sentence. 4 pencils away.How many pencils does Lena Step 2.have left? Solve.Lena has pencils left.178

Write the value of each group of coins. Cumulative ReviewCompare. Write >, <, or =. 1. ¢ ¢ ¢ 2. ¢Write the time. 4. 5.3.:: :minutes after minutes after minutes afterDraw the hands to show the time. 8.6. 7. 10:20 8:30 3:05Chapter 5 Lesson 18 179

Complete the number line. Fill in the sum. +61. 27 + 6 = 27 2. 58 + 20 = 3. 58 + 22 = 58 +22Add. 58 4. 5. 6. 56 +38 39 67 +26 +27Reorder and add to find the sum.7. 47 + 19 + 23 8. 28 + 36 + 34Reorder: + Reorder: + + + + ++ +180

6Xxx CHAPTER Xxx Three-Digit NumbersVOCABULARY 328 = 300 + 20 + 8 Hundreds Skip-Count by Fives Skip-Count by Tens Skip-Count by 100s495 5L0es0s1o01n111 12 110152110CC225SS21.10A01.113 123 X313x53x01.1141042143140151152153515011561115623611640167117217315174201708118211831118401589118921Chapter 2

Xxx. w2

We use: We use: Exploring One HundXrexdx We use:to represent ones. to represent tens. to represent hundreds.We can use 10 smaller models to make 1 larger model.10 ones = 1 ten = 10 10 tens = 1 hundred = 1001. Circle 10 groups of ten to show 1 hundred. tens = hundred =Chapter 6 Lesson 1 2.NBT.1.a 183

1. Circle 10 groups of ten to show 1 hundred. tens = hundred =184

Numbers to 200Write the number shown by the models. Then write the number name. 1. 2. 3.Hundreds Tens Ones Hundreds Tens Ones Hundreds Tens OnesNumber: Number: Number:one hundred one one hundred two one hundred three4. 5. 6.Hundreds Tens Ones Hundreds Tens Ones Hundreds Tens OnesNumber: Number: Number:one hundred four one hundred five one hundred six7. 8. 9.Hundreds Tens Ones Hundreds Tens Ones Hundreds Tens OnesNumber: Number: Number:one hundred seven one hundred eight one hundred nineChapter 6 Lesson 2 2.NBT.1 185

Write the number shown by the models. Then write the number name. 1. 2. 3.Hundreds Tens Ones Hundreds Tens Ones Hundreds Tens OnesNumber: Number: Number:one hundred ten one hundred twenty one hundred thirty4. 5. 6.Hundreds Tens Ones Hundreds Tens Ones Hundreds Tens OnesNumber: Number: Number:one hundred forty one hundred fifty one hundred sixty7. 8. 9.Hundreds Tens Ones Hundreds Tens Ones Hundreds Tens OnesNumber: Number: Number:one hundred seventy one hundred eighty one hundred ninety186

The Base-Hundred NumbersWrite the number shown by the models. Then write the number name. 1. 2. 3.Hundreds Tens Ones Hundreds Tens Ones Hundreds Tens OnesNumber: Number: Number:one hundred two hundred three hundred4. 5.Hundreds Tens Ones Hundreds Tens OnesNumber: Number: 187four hundred five hundredChapter 6 Lesson 3 2.NBT.1.b

Write the number shown by the models. Then write the number name. 1. 2.Hundreds Tens Ones Hundreds Tens OnesNumber: Number:six hundred seven hundred3. 4.Hundreds Tens Ones Hundreds Tens OnesNumber: Number:eight hundred nine hundred188