Spots Book Grade 2 - Volume I

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 48 48 50 54Complete the number line. Write the difference. –4 1. 63 63 –42. –7 34 34–7 –83. 96 96–8Chapter 4 Lesson 11 145

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 51 146 –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 62 –2 4. 9 3 –5 –5 –2 90 935. 4 0 6. 4 1 –4 –5 –4 –57. 7 0 40 41 –1 8. 7 3 –4 –4 –1 70 73Chapter 4 Lesson 12 147

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! 34 –5148

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 = 149Chapter 4 Lesson 13

Choose the way that works best for you. –Subtract. – 1. – – 95 – 6 = 2. 80 – 5 = 3. 30 – 8 = 4. 63 – 27 = 150

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 4 Lesson 14 151

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 of Step 4: Check your answer.paper from the printer.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. Whole How many points was the question worth? Part Part The question was worth Step 3: Solve. points. Step 4: Check your answer.152

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 4 Lesson 15 153

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.154

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 Part Partat 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 Part Part Tommy’s mom give him? Step 3: Solve. Tommy’s mom gave him _____ balloons. Step 4: Check your answer.Chapter 4 Lesson 16 155

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. Whole How many blocks fell off the tower? ____ blocks fell of the tower. Part Part Step 3: Solve. Step 4: Check your answer.156

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 4 Lesson 17 157

Do we have to regroup? Circle the correct sign.Subtract.1. 2. 3. 4. 3 52 3 64 3 62 3 87 2 –2 3 2 –2 1 2 –4 7 2 –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.158

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. 7. 40¢ 8. 159 50¢ 9. 38¢Chapters 1- 3

Complete the number line. Fill in the sum. +61. 57 57 + 6 =2. 68 + 20 = 3. 68 + 23 = +23 68 68Add. 5. 6. 4. 48 67 +26 +15 56 +35Reorder and add to find the sum.7. 27 + 18 + 23 8. 21 + 36 + 34Reorder: + Reorder: + + + + ++ +160