Spots Book Grade 2 - Volume I

Adding Only Tens vs. Adding Only OnesWe can add to two-digit numbers.35 10 10 10 35 10 10 10+2 + 2037 55 10 10 Sometimes we add ones. Sometimes we add tens.Circle to show if we are adding tens or ones. Add.1. 2. 58 3. 46 Tens +3 0 Tens +2 Tens 6 4 Ones Ones Ones + 34. 85 5. 36 6. Tens +4 Tens +3 Tens 5 4 Ones Ones Ones + 2 07. 43 8. 54 9. Tens +3 0 Tens +5 Tens 3 8 Ones Ones Ones + 3 010. 11. 12. Tens 5 1 Tens 6 3 Tens 7 4 Ones + 4 0 Ones + 2 0 Ones + 3Chapter 3 Lesson 10 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 2 Two-Digit NumbersWe can add two two-digit numbers. We make 2 jumps: 36 + 22 = 58one jump for the tens,one jump for the ones. +22 +20 +2 56 58 36Complete the number line. Fill in the sum.1. 46 + 20 = 2. 46 + 23 = +23 46 463. 37 + 30 = 4. 37 + 32 =37 +32 375. 53 + 20 = 6. 53 + 21 = +2153 53Chapter 3 Lesson 11 97

Complete the number line. Fill in the sum.1. 52 + 31 = +31 522. +33 52 + 33 =3. 52 36 + 21 = +214. 36 36 + 23 = +235. 36 54 + 24 = +24 546. +22 54 + 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 66Complete 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 12 99

Complete the number line. Write the sum.1. +1268 + 12 = 682. +24 46 + 24 = 463. +33 37 + 33 = 37Help the number machine add. Fill in the sums.4. +24 265. 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. +21 + 21 = 472. +23 47 + 23 = 473. +21 +22 68 + 21 = +32 68 +34 +354. 68 + 22 = 685. 36 + 32 = 366. 36 + 34 = 367. 45 + 35 =Chapter 3 45 101 Lesson 13

Help the number machines add. Fill in the sums.1. +14 252. 353. 74. +235. 566. 76Let’s Review!Identify the missing addend.7.37 + = 40 8. 52 + = 60 9. 86 + = 90 = 7010. 11. 12. 74 + = 80 15 + = 20 68 +102

Adding with Three Jumps28 + 26 = 5 4 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 14

Complete the number line. Fill in the sum.1. 59 + 21 = +21 592. +28 59 + 28 = 593. +32 48 + 32 = 484. +36 48 + 36 = 485. +22 68 + 22 = 686. +25 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. 27 38 + 17 = +173. 38 46 + 35 = +354. 46 69 + 27 = +275. 69 57 + 34 = +34 576. +26 36 + 26 = 367. +15 78 + 15 = 78Chapter 3 Lesson 15 105

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 Part There are _____ books on the shelf.106

Drawing with Two or Three Jumps Sometimes we make 2 jumps.64 + 32 = 96 +32 +2 +30 94 96 2 jumps 3 jumps 64 Sometimes we make 3 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 = +212 jumps3 jumps 472. 68 + 25 = +25 2 jumps 68 3 jumps3. 67 + 15 = +152 jumps 673 jumps4. 35 + 24 = +242 jumps 353 jumpsChapter 3 Lesson 16 107

Complete the number line.Use either two or three jumps.Write the sum. Circle how many jumps.1. 37 + 26 = +262 jumps 373 jumps2. +36 57 + 36 = 57 2 jumps 3 jumps3. +24 + 24 =2 jumps 743 jumps4. 45 +35 59 +38 45 + 35 = 2 jumps 3 jumps5. + 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 3 591. 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 17 109

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. 39 the new ten. Last we add the tens.+2 5 3. Tens Ones 64 3Add. Remember to start with the ones.1. Tens Ones 2. Tens Ones 37 46 38+3 4 +3 5 +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 18 111

Add. Remember to start with the ones.1. 2. 3. 4.Tens Ones Tens Ones Tens Ones Tens Ones 39 69 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. + 5. 25¢ + 25¢112

Practice: Adding in Columns Tens Ones Tens Ones 3 46 3 74 2 +3 5 2 +1 4 8 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 Ones3 35 3 61 3 362 +6 4 2 +2 8 2 +2 64. 5. 6. 3 49 3 53 3 47 2 +3 9 2 +4 6 2 +2 57. 8. 9. 3 38 3 42 3 67 2 +3 5 2 +3 6 2 +2 5Chapter 3 Lesson 19 113

Will we fill in a new ten? Circle the correct sign.Add. Remember to start with the ones.1. 2. 3. 4. 3 56 3 69 3 38 3 55 2 +23 2 +17 2 +25 2 +345. 6. 7. 8. 3 45 3 57 3 46 3 62 2 +44 2 +12 2 +4 6 2 +289. 10. 11. 12. 3 43 3 28 3 53 3 37 2 +25 2 +27 2 +3 4 2 +14Fill in the math puzzle and write a number sentence. WholeUse a for the unknown number. Solve.10. 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 20

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 21 117

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 and solve. Use a for the unknown number.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 22 119

Write a number sentence and solve. Use a for the unknown number.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 22 books on the Write a number sentence. middle shelf and 30 books on the bottom shelf.How many books are on the Step 2:bookshelf? Solve.There are books on the + +bookshelf.3. Elroy has 22 toy cars, 23 toy Step 1: trucks, and 14 toy trains. Write a number sentence.How many toys does Elroy have? Step 2:Elroy has toys. Solve. ++120

End-of-Chapter ReviewAdd. 4 6 2. 4 5 4 3. 5 85 1. 6 + 3 +3 + 3 +4 + 4 +34. 8 6 8 5. 5 7 5 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 + = 60Circle the addends that combine to form a new ten.Add. Then add the rest.9. 67 + 5 + 3 10. 56 + 4 + 8 += +=Add. 17. 37 + 40 = 18. 37 + 41 =11. 46 + 30 = 14. 55 + 10 = 19.12. 15. 37 + 43 = 46 + 32 = 55 + 13 = 12113. 16. 46 + 34 = 55 + 15 =Chapter 3 Lesson 23

Complete the number line. Fill in the sum.1. +6 47 + 6 = 472. 3. 49 + 21 = 49 + 24 = +21 +24 49 49Add. Remember to start with the ones.4. 5. 6. 56 48 67 +35 +26 +15Reorder and add to find the sum. 8. 21 + 36 + 34 7. 27 + 18 + 23 Reorder: Reorder: ++ +++ ++ +122

XxxXxx CHAPTER 4 Subtraction with Two-Digit NumbersChapter 4 Lesson 2.0A.1 Xxx. 123

Xxx.124

Subtracting Ones from Two-Digit NumbXexrxs When we subtract ones, the number of tens does not change. 27 – 3 = 24Write the number sentence. 2.1.–= –=3. 4.–= –= 46 – 5 =Cross off to subtract. Write the difference.5. 6. 58 – 3 =Chapter 4 Lesson 1 125

Subtract. 67 2. 3. 1. –5 9 39 8 48 –5 –6 –6 –4 –44. 5. 6. 7. 8. 84 98 58 84 27 –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 fish126

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. 6. 45 – 30 = 35 – 10 =Chapter 4 Lesson 2 127

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. 12. 13. 14. 15. 48 93 84 76 73 – 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 Part Part of them are gray. How many gray fish are there in Mark’s fish tank? Number sentence: There are gray fish in his tank.128

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 30¢, and he Write the number sentence. paid 4¢ tax. Step 2: – How much money does Solve. Eduardo have left? – Eduardo has ¢ left.Chapter 4 Lesson 3 129

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. Step 2: – Solve. How much money does Ms. Jensen have left? – 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. Jeff thentook 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.130

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 4 Lesson 4 131

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. _ _132

Regrouping with Dot CardsSometimes we do not have enough ones to subtract. Then:1. Regroup. Move over a ten to the ones place to form a teen number. Write the new numbers.2. Subtract the ones.3. Subtract the tens. Tens Ones 3 12 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 Ones Tens Ones 36 22 –2 8 –1 33. 4. Tens Ones Tens Ones 45 47 –2 7 –1 9Chapter 4 Lesson 5 Regrouping with Dot Cards 133

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. –134

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 9Regroup 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 4 Lesson 6 135

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 Ones5.7. Tens Ones 44 –2 8 136 34 –1 5 Tens Ones 6. 31 –1 6 Tens Ones Tens Ones 41 –1 9 72 –1 6

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 4 Lesson 7 137

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. 53 43 64 95 –1 6 –3 7 –3 5 –5 89. 10. 11. 12. 93 77 53 61 –4 7 –4 9 –2 4 –4 613. 14. 15. 16. 85 96 73 87 –4 9 –5 7 –2 4 –7 9LET’S WRITE!Explain why or why not.138

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.2. There are 36 eggs in cartons Step 1:and 12 eggs in a bin. Tami takes Write the number sentence.3 eggs.How many eggs are left? Step 2:There are eggs left. Solve.3. Paul has $42. He spends $20. Step 1: Later, his father gives him $10. Write the number sentence.How much money does Paul Step 2:have now? Solve.Paul has $ .Chapter 4 Lesson 8 139

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.140

Mixed Practice: Subtracting in Columns3 54 3 672 –2 8 2 –3 4 Sometimes we need to Sometimes we haveregroup to have enough enough to subtract without regrouping. to subtract.Do we have to regroup? Circle the correct sign.Subtract.1. 2. 3.3 61 3 84 3 582 –3 6 2 –4 7 2 –2 74. 5. 6. 3 96 3 72 3 66 2 –46 2 –2 8 2 –4 27. 8. 9. 3 82 3 87 3 73 2 –5 7 2 –5 3 2 –4 5Chapter 4 Lesson 9 141

Do we have to regroup? Circle the correct sign.Subtract.1. 2. 3. 4.3 74 3 62 3 91 3 682 –3 3 2 –37 2 –54 2 –265. 6. 7. 8. 3 84 3 43 3 72 3 43 2 –56 2 –23 2 –26 2 –189. 10. 11. 12. 3 65 3 76 3 87 3 91 2 –29 2 –25 2 –64 2 –56Write a number sentence and solve. Use a for the unknown number.10. Sam is putting books in boxes. Step 1: There were 25 books on shelves Write the number sentence. and 14 books on the floor. Sam already put 8 of the books Step 2: in boxes. Solve. How many books does Sam have left to box?Sam has books left to box.142

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 4 Lesson 10 143

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. 5. 70 60 –1 –2 706. 7. 80 90 –3 –5 808. 9. ON YOUR OWN! 50 40 –4 50 – 5144