Grade 2 Student Edition

Adding Ones with Two JumpsWhen we add in two steps, we make two jumps:First we make a jump to get to the next ten.Then we make another jump to add the rest. +8 1919 + 8 =Color the dots and draw an arrow to complete the ten.Fill in the number line. Add.1. +637 + 6 = 372. +7 2828 + 7 = +53. 56 56 + 5 = 89Chapter 3 Lesson 8

Color the dots and draw an arrow to complete the ten.Fill in the number line. Add. 1. +5 47 + 5 = 47 +62. 28 + 6 = 28 +43.39 + 4 =CENTRALE LYON 39Help the number machine add. Fill in the sums. CENTRALE LYON CENTRALE LYON4. +8 CCEENNTTRRAALLEE LLYYOONN25CENTRALE LYON 30 335. 45CENTRALE LYON6. 6590

Adding Ten to a Two-Digit NumberWhen we add ten to a two-digit number,the number of ones stays the same. 46 46 and 1 ten+10 is 5 tens and 6 ones – 56 56 in all.Write the number sentence. Solve. 1. 2.3. 4.Make a simple drawing to show the addition.5. 22 + 10 = 6. 27 + 10 = 7. 36 + 10 =Chapter 3 Lesson 9 91

When we jump 10 on the number line, the number of onesstays the same. 79 +10 +10 89 79 89Complete the number line. Fill in the sum.1. 50 + 10 = 2. 54 + 10 = 50 543. 40 + 10 = 4. 43 + 10 = 40 435. 30 + 10 = 6. 36 + 10 = 30 7 9 8. 4 0 36 35 + 10 +1 0 4 7 9. 3 0 +1 0Add. +1 0 +1 0 7. 7 0 +1 010. 11. 12. 13. 14. 15. 27 85 32 29 62 68 +1 0 +1 0 +1 0+1 0 +1 0 +1 092

Adding Decade NumbersTo add tens on the number line we can either jump10 at a time OR we can jump all the tens at once.We begin with 49 and jump to 59, 4969, and 79. The sum is 79.49 + 30 = 79We begin with 49 and jump to 79. 49The sum is 79.49 + 30 = 79Complete the number line. Fill in the sum.1. + 30 = 2. 40 40 + 30 =+3040 403. + 30 = 4. 46 46 + 30 = +30 4646Chapter 3 Lesson 10 93

Complete the number line. Fill in the sum.1. + 40 = 2. 50 50 + 40 =+4050 503. + 40 = 4. 54 54 + 40 =+4054 54 CENTRALE LYON CENTRALE LYONHelp the number machine add. Fill in the sums. CENTRALE LYON CCEENNTTRRAALLEE LLYYOONN5. +3045CENTRALE LYON6. 46CENTRALE LYON7. 4794

Adding Only Tens vs. Adding Only OnesWe can add to two-digit numbers. 35 10 10 10 35 10 10 10+2 +2 0 Sometimes we add ones. 10 10 37 55 Sometimes we add tens.Circle to show if we are adding tens or ones. Add.1. 64 2. 58 3. 46 Tens +3 Tens +3 0 Tens +2 Ones Ones Ones4. 85 5. 36 6. 54 Tens +4 Tens +3 Tens +2 0 Ones Ones Ones7. 43 8. 54 9. Tens +3 0 Tens +5 Tens 3 8 Ones Ones Ones + 3 010. 51 11. 12. 74 Tens +4 0 Tens +3 Ones Tens 6 3 Ones Ones + 2 0Chapter 3 Lesson 11 95

Add. 2. 5 3 3. 2 7 4. 6 4 +6 +2 0 +3 0 1. 4 8 +3 05. 8 1 6. 3 3 7. 3 7 8. 9 2 +7 +4 +2 0 +59. 7 5 10. 1 3 11. 3 2 12. 4 2 +2 0 +5 +6 +4 0LET’S WRITE!Look at exercise 12. Explain what digit changed and why.Fill in the math puzzle and write the number sentence. WholeUse a for the unknown number. Solve.13. Michaela has 44 colored pencils in her art box. She has 20 colored pencils that are not in the box. How many colored pencils does Michaela have?Number sentence: Part Part Michaela has _____ colored pencils.96

Adding Two 2-Digit NumbersWe can add two 2-digit numbers on the number line. We make 2 jumps: 36 + 22 = 58 +2one jump for the tens,one jump for the ones. +22 +20 36 56 58Complete the number line. Fill in the sum.1. 46 + 20 = 2. 46 + 23 = +2346 463. 37 + 30 = 4. 37 + 32 =37 +32 375. 53 + 20 = 6. 53 + 21 = +2153 53Chapter 3 Lesson 12 97

Complete the number line. Fill in the sum.1. 52 + 31 = +31 522. 52 + 33 = +333. 36 + 21 = 52 +21 364. 36 + 23 = +23 365. 54 + 24 = +24 546. 54 + 22 = +22 547. ON YOUR OWN! 65 + 14 =98

Adding to the Next Ten36 + 34 = 70 We make two jumps. First we jump the tens. 6 and Then we jump to get to 4 make a ten. the next ten.We have 7 tens in all. 36 +34 +30 +4 66 70Complete the number line. Fill in the sum.1. 27 + 10 = 2. 27 + 13 = +1327 273. 48 + 30 = 4. 48 + 32 = +3248 485. 37 + 20 = 6. 37 + 23 = +23 37 37Chapter 3 Lesson 13 99

Complete the number line. Write the sum.1. +1268 + 12 = 682. +24 46 + 24 = 463. +33 37 + 33 = 37 CENTRALE LYON CENTRALE LYON CENTRALE LYON CCEENNTTRRAALLEE LLYYOONNHelp the number machine add. Fill in the sums.4. +24 CENTRALE LYON 265. CENTRALE LYON 466. 56LET’S WRITE! Look at the sums that came out of your number machine. How are they the same? How are they different? Explain why.100

Practice: Adding to the Next TenComplete the number line. Write the sum.1. 47 + 21 = +21 472. 47 + 23 = +23 473. 68 + 21 = +21 684. 68 + 22 = +22 685. 36 + 32 = +32 366. 36 + 34 = +34 367. 45 + 35 = +35Chapter 3 45 101 Lesson 14

CENTRALE LYON CENTRALE LYON CENTRALE LYONHelp the number machines add. Fill in the sums. CCEENNTTRRAALLEE LLYYOONN1. +14 25CENTRALE LYON2. CENTRALE LYON 353. +23 CENTRALE LYON CENTRALE LYON 75CENTRALE LYON CCEENNTTRRAALLEE LLYYOONN4. CENTRALE LYON 375. CENTRALE LYON 476. 67Let’s Review!Identify the missing addend.7.37 + = 40 8. 52 + = 60 9. 86 + = 90 = 20 12. 68 + = 70107. 4 + = 80 11. 15 +102

Adding with Three Jumps28 + 26 = 54 We make three jumps. First we jump the tens. 8 and Then we jump to get 2 form a ten. to the next ten. Then we jump again for the rest of the ones. +26 +2 +4 +20 48 50 54We have 5 tens 28and 4 ones in all.Complete the number line. Fill in the sum.1. 39 + 21 = +21 392. 39 + 26 = +263. 58 + 12 = 394. 58 + 14 = +12 58 +14Chapter 3 58 103 Lesson 15

Complete the number line. Fill in the sum.1. 59 + 21 = +21 592. 59 + 28 = +28 593. 48 + 32 = +32 484. 48 + 36 = +36 485. 68 + 22 = +22 +25 686. 68 + 25 = 687. ON YOUR OWN! 57 + 35 =104

Practice: Adding with Three JumpsComplete the number line. Fill in the sum.1. 27 + 25 = +252. 38 + 17 = 27 +173. 46 + 35 = 38 +354. 69 + 27 = 465. 57 + 34 =6. 36 + 26 = +27 69 +34 57 +26 367. 78 + 15 = +15 78Chapter 3 Lesson 16 105

Complete the number line. Fill in the sum.1. +36 47 + 36 =2. 47 58 + 14 = +143. 58 36 + 25 = +25 36ON YOUR OWN!4. 67 + 27 =Fill in the math puzzle and write the number sentence. WholeUse a for the unknown number. Solve. 5. The library has 25 children’s books and 20 adult books on the display shelf. How many books are there on the shelf?Number sentence: Part PartThere are _____ books on the shelf.106

Drawing with Two or Three Jumps Sometimes we make two jumps.64 + 32 = 96 +32 +2 +30 94 96 2 jumps 64 3 jumps Sometimes we make three jumps.46 + 45 = 91 46 +45 +40 +4 +1 2 jumps 3 jumps 86 90 91Complete the number line. Use either 2 or 3 jumps. Write the sum.Circle how many jumps.1. 47 + 21 = +21 2 jumps3 jumps 472. 68 + 25 = +25 2 jumps 68 3 jumps3. 67 + 15 = +15 2 jumps 67 +24 3 jumps4. 35 + 24 =2 jumps 353 jumpsChapter 3 Lesson 17 107

Complete the number line. Use either two or three jumps.Write the sum. Circle how many jumps.1. 37 + 26 = +262 jumps 373 jumps2. 57 + 36 = +36 2 jumps 57 3 jumps3. 74 + 24 = +242 jumps 743 jumps4. 45 + 35 = 45 +35 59 +38 2 jumps 3 jumps5. 59 + 38 = 2 jumps 3 jumpsON YOUR OWN!6. 53 + 41 = 2 jumps 3 jumps108

Adding in Columns We can add in columns. Tens Ones First, we add the ones. Then, we add the tens. 36 +2 3 59Add. Remember to start with the ones.1. Tens Ones 2. Tens Ones 3. Tens Ones 34 72 55 +3 2 +1 3 +2 44. Tens Ones 5. Tens Ones 6. Tens Ones 52 64 41 +1 7 +3 5 +2 57. Tens Ones 8. Tens Ones 9. Tens Ones 72 24 62 +2 6 +2 4 +3 2Chapter 3 Lesson 18 109

Add. 2. Tens Ones 3. Tens Ones 4. Tens Ones 1. Tens Ones 67 72 53 +3 2 +2 4 +3 6 46 +2 15. Tens Ones 6. Tens Ones 7. Tens Ones 8. Tens Ones 45 25 86 53 +2 3 +2 4 +1 2 +2 39. Tens Ones 10. Tens Ones 11. Tens Ones 12. Tens Ones 52 42 44 31 +2 6 +3 5 +3 1 +2 7Solve the story problem.13. The children at the lemonade stand sold 47 small cups of lemonade and 32 large cups of lemonade.How many cups of lemonade did they sell in all? +They sold cups of lemonade in all.LET’S WRITE!Explain how you added to solve the story problem.110

Adding in Columns with Regrouping We can add in columns. Tens Ones 2 1 1 Then, we fill in First, we add the ones. the new ten. Last, we add the tens. 39+2 5 3 64Add. Remember to start with the ones.1. Tens Ones 2. Tens Ones 3. Tens Ones 37 46 38+3 6 +3 4 +2 54. Tens Ones 5. Tens Ones 6. Tens Ones 49 27 39 +2 9 +2 7 +2 57. Tens Ones 8. Tens Ones 9. Tens Ones 58 67 39 +2 3 +2 5 +1 4Chapter 3 Lesson 19 111

Add. Remember to start with the ones.1. 2. 3. 4.Tens Ones Tens Ones Tens Ones Tens Ones 39 59 47 25+2 6 +3 4 +3 5 +2 55. 6. 7. 8. Tens Ones Tens Ones Tens Ones Tens Ones 57 76 38 48 +1 6 +1 5 +2 8 +3 79. 10. 11. 12. Tens Ones Tens Ones Tens Ones Tens Ones 46 47 19 26 +2 6 +3 7 +1 8 +1 9Add to find the value of 2 quarters. +13. 25¢ + 25¢112

Practice: Adding in Columns Tens Ones Tens Ones P 46 P 74 O +3 7 O +1 4 83 88Sometimes we do Sometimes fill in a new ten. we do not.Will we fill in a new ten? Circle the correct sign.Add. Remember to start with the ones.1. 2. 3.Tens Ones Tens Ones Tens OnesP 35 P 61 P 36O +6 4 O +2 8 O +2 64. 5. 6. P 49 P 53 P 47 O +3 9 O +4 6 O +2 57. 8. 9. P 38 P 42 P 67 O +3 5 O +3 6 O +2 5Chapter 3 Lesson 20 113

Will we fill in a new ten? Circle the correct sign.Add. Remember to start with the ones.1. 2. 3. 4. P 56 P 69 P 38 P 55 O +23 O +17 O +25 O +345. 6. 7. 8. P 45 P 57 P 46 P 62 O +44 O +12 O +4 6 O +289. 10. 11. 12. P 43 P 28 P 53 P 37 O +25 O +27 O +3 4 O +14Fill in the math puzzle and write a number sentence. WholeUse a for the unknown number. Solve.13. Mrs. Kramer baked 22 chocolate chip cookies and 14 oatmeal cookies. How many cookies did she bake altogether?Number sentence: Part PartShe baked _____ cookies altogether.114

Add: 78 + 6 = Choosing a Strategy to AddWhich way works best for you? I like to use I like to use columns. a number line.+6 1+2 +4 78 +678 80 84 84Choose the way that works best for you. Add. 1. + 46 + 30 =2. 86 + 4 = + 3. + 69 + 26 = 115Chapter 3 Lesson 21

Choose the way that works best for you. +Add. + 1. + + 29 + 7 = 2. 57 + 3 = 3. 75 + 23 = 4. 45 + 38 = 116

Adding with Three AddendsWe can add in any order.We can reorder the addends to add 36 + 28 + 14.Look for digits in Reorder the Now add the first Add the thirdthe ones place addends. two addends. addend to thethat add to 10. sum.36 + 28 + 14 36 + 14 + 28 1 50 + 286 and 4 make 36a ten. + 14 50 78So, 36 + 28 + 14 = 36 + 14 + 28 = 78.Reorder and add to find the sum. 2. 1. 19 + 27 + 23 17 + 18 + 22Reorder: + Reorder: + + +Add the first Add the third Add the first Add the thirdtwo addends. addend to the two addends. addend to the sum. sum.++ ++Chapter 3 Lesson 22 117

Reorder and add to find the sum.1. 16 + 33 + 34 2. 32 + 24 + 36Reorder: + Reorder: + + +++ ++3. 52 + 17 + 23 4. 43 + 16 + 27Reorder: + Reorder: + + ++ ++ + +Add to find the value of 3 quarters. + 5. 25¢ + 25¢ + 25¢118

Two-Step Story ProblemsWrite a number sentence. Order the numbers in the way that is easiestfor adding. Use a for the unknown number. Solve.1. Julia put 25 roses, 12 tulips, and Step 1.5 daises in a vase. Write a number sentence.How many flowers did Julia put Step 2.in the vase? Solve.Julia put flowers in the +vase. +2. Ken read 32 pages on Monday. Step 1. He read 8 pages on Tuesday and Write a number sentence. 15 pages on Wednesday.How many pages did Ken read Step 2.in all? Solve.Ken read pages in all. + +3. Talia drew 13 pictures in May. Step 1. She drew 15 pictures in June Write a number sentence. and 7 pictures in July.How many pictures did Talia Step 2.draw in all? Solve.Talia drew pictures in all. + +Chapter 3 Lesson 23 119

Write a number sentence. Order the numbers in the way that is easiestfor adding. Use a for the unknown number. Solve.1. There are 15 spoons, 10 forks, Step 1. and 5 glasses on a table. Write a number sentence.How many objects are on the Step 2.table? Solve.There are objects are on + +the table.2. There are 24 books on the top Step 1. shelf. There are 26 books on the Write a number sentence. middle shelf and 30 books on the bottom shelf. Step 2. Solve.How many books are on the +bookshelf? +There are books on thebookshelf.3. Elroy has 22 toy cars, 23 toy Step 1. trucks, and 17 toy trains. Write a number sentence.How many toy vehicles does Step 2.Elroy have? Solve.Elroy has toy vehicles. + +120

End-of-Chapter ReviewAdd. 4 6 2. 4 54 3. 5 85 + 3 +3 +3 +4 +4 1. 6 +34. 8 6 8 5. 5 75 6. 7 37 +2 + 2 +5 + 5 +3 +3Fill in the missing addend to complete the number sentence.7. 6 + = 10 8. 3 + = 10 16 + = 20 13 + = 20 26 + = 30 23 + = 30 76 + = 80 53 + = 60Reorder and add to find the sum. 10. 21 + 36 + 34 9. 27 + 18 + 23Reorder: + Reorder: + + ++ ++ +Chapter 3 Lesson 24 121

Complete the number line. Fill in the sum.1. +6 47 + 6 = 472. 3. 49 + 21 = 49 + 24 = +21 +24 49 49 6.Add. Remember to start with the ones. 67 4. 5. +1 5 56 48 +3 5 +2 6Write a number sentence. Order the numbers in the way that is easiestfor adding. Use a for the unknown number. Solve.7. Jeremy has 55¢. His dad gives Step 1. him a quarter as a prize. Later, Write a number sentence. his mother gives him a dime.How much money does Jeremy Step 2.have now? Solve.Jeremy has ¢ now. ++122

4Xxx CHAPTER Xxx TimeVOCABULARY 8:30 Hour Minute Half hour Quarter after Quarter to 55 0 5 50 45 1010:45 40 15 35 20 30 25Chapter 2 Lesson CCSS1.0A.1 Xxx. 1

Xxx. w2

O’clXoxckxThe short hand The long handtells the hour. tells the minutes. 7:00 When the long hand is exactly on the 12, we say o’clock. The time on the clock is 7 o’clock.Write the time. 1. 2. 3. :: : o’clock o’clock o’clock4. 5. 6. :: :Chapter 4 o’clock 2.MD.7 o’clock o’clock Lesson 1 125

Draw the hands to show the time. 3.1. 2. 2:00 8:00 12:004. 5. 6. 5 o’clock 11 o’clock 3 o’clockWrite the time that the clock tells.7. 6 o’clock 8. 9 o’clock 9. 7 o’clock :: :Look at the hour hand and circle A or B for the correct clock.10. 11.Which clock Which clockshows almost shows after2:00? 10:00? A B A B126

There are 30 minutes Half Hour in a half hour. When the long hand is on the 6, it is half past the hour. The time on the clock is 2:30.Write the time. 2. 3. 1. : : : thirty half past minutes after4. 5. 6. : : : thirty half past minutes afterChapter 4 Lesson 2 2.MD.7 127

Draw the hands to show the time. 3. 1. 2. 1:30 4:30 10:304. 5. 6. 12:30 2:30 6:307. 8. 9. seven thirty half past 5 30 minutes after 810. 11. 12. nine thirty half past 11 30 minutes after 3128

30 Minutes: Before and AfterWrite the time. Time Now 30 Minutes After 30 Minutes Before 1. : :2. : :3. : :4. : :5. : :Chapter 4 Lesson 3 2.MD.7 129

Write the time. Time Now 30 Minutes After 30 Minutes Before 1. : : : : :2. : :3. :4. :5. :130

Time to the Five Minutes When we read the long hand on a clock, each number represents 5 minutes. 55 0 5 The time on the clock is 3:25.50 10 The time can also be read as: n 25 minutes after 345 15 n three twenty-five n 25 after 340 20 25 3. 35 30 2.Write the time. 1. :: :10 minutes after 7 minutes after minutes after 5. 6. 4. :: : minutes after minutes after minutes afterChapter 4 Lesson 4 131 2.MD.7

Write the time. 2. 3. 1. :: :minutes after minutes after minutes afterDraw the hands to show the time. 6.4. 5. 6:35 12:05 8:557. 8. 9. four fifty forty minutes after 5 25 minutes after 5Look at the hour hand, and circle A or B for the correct clock.10. 11.Which clock Which clockshows almost shows after9:00? 11:00?132

Write the time. Practice Time to the Five Minutes 1. 2. 3.:: :40 minutes after 7 minutes after minutes after 5. 6. 4. : : : minutes after minutes after minutes after7. 8. 9.:: : minutes after minutes after minutes afterChapter 4 Lesson 5 133 2.MD.7

Draw the hands to show the time. 3. 1. 2. 4:05 8:40 2:504. 5. 6. 3:15 7:35 11:557. 8. 9.five forty-five nine twenty-five two thirtyLook at the hour hand, and circle A or B for the correct clock.10. 11.Which clock Which clockshows after shows almost6:00? 12:00?134

Quarter After, Quarter to There are 15 minutes in a quarter hour.When the long hand is on the 3, When the long hand is on the 9,it is a quarter after the hour. it is a quarter to the next hour.The time on the clock is 4:15. The time on the clock is 4:45.The time can also be written The time can also be writtenin these ways: in these ways:n four fifteen n four forty-fiven 15 minutes after 4 n 45 minutes after 4n a quarter after 4 n 15 minutes before 5n a quarter past 4 n a quarter to 5Write the time. 2. 3. 1.::: a quarter after 2 a quarter 7 a quarter 8 minutes after minutes before minutes afterChapter 4 Lesson 6 2.0A.1 135

Write the time. 2. 3. 1. :: :a quarter 11 a quarter 12 a quarter 4minutes before minutes after minutes beforeDraw the hands to show the time.4. 5. 6. 1:15 9:45 11:157. 8. 9. seven forty-five a quarter after 5 a quarter to 12136

AM and PMThere are 24 hours in a day. A clock shows only 12 hours.A day is divided into two equal parts.The time from 12 midnight to 12 noon is called AM.The time from 12 noon to 12 midnight is called PM.The sun can be seen at 12 noon.The moon can be seen at 12 midnight.Circle the time that makes sense. 8:30 am1. The time school starts 8:30 pm2. 7:00 am The time you go to sleep 7:00 pm3. 12:30 am The time you eat lunch 12:30 pm4. 10:30 am The time you go to a museum 10:30 pm 7:30 am5. 7:30 pm The time you eat breakfast 4:00 am6. 4:00 pm The time you return home from school 1:00 am7. 1:00 pm The time you may have math class 137Chapter 4 Lesson 7 2.MD.7

Circle the time that makes sense. 5:30 am 1. 5:30 pm The time you eat dinner 4:30 am 4:30 pm 2. 5:30 am The time soccer practice starts 5:30 pm 3. 6:00 am The time you do your homework 6:00 pm 6:00 am 4. 6:00 pm The time the sun rises 4:30 am 4:30 pm 5. 10:00 am The time the sun sets 10:00 pm 6. 2:00 am The time you go to the park 2:00 pm 4:00 am 7. 4:00 pm The time you go to the zoo 8. The time you go to visit relatives 9. The time you are sleeping 138