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18 Grade 5 • Add and Subtract Decimals

Multi-PartLesson 1

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Homework PracticeRound Decimals

Round each decimal to the place indicated.

1. 1.583; ones 2. 67.095; tenths

3. 5.67; ones 4. 7.123; hundredths

5. 0.069; hundredths 6. 0.254; tenths

7. 569.858; hundredths 8. 13.47; tenths

9. The price of a gallon of milk is $3.75. Rounded to the nearest dollar, about how much money is this?

Use any strategy shown below to solve each problem.

• Guess, check, and revise • Solve a simpler problem • Use the 4-step plan

10. The quotient of two numbers is 21. Their difference is 60. What are the two numbers?

11. Ninety-four students are going on a field trip to the museum. Each van holds 15 students and each car holds 5 students. Using the fewest number of vehicles possible, how many vans and how many cars are needed?

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Grade 5 • Add and Subtract Decimals 19

Multi-PartLesson 1

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Problem-Solving PracticeRound Decimals

For Exercises 1 and 2, use the table.

The table shows the average cost per gallon of unleaded gasoline.

Gasoline Cost

Year Price per Gallon

1990 $1.16

1995 $1.25

2000 $1.51

2005 $2.03

1. Round the price per gallon of gasoline in 2000 to the nearest tenth of a dollar. Then round it to the nearest dollar.

2. Round the price per gallon of gasoline in 1990 to the nearest tenth of a dollar. Then round it to the nearest dollar.

For Exercises 3–8, use the following information.

The Everglades National Park gets an average of 59.10 inches of rainfall a year. On average, about 1.026 million people visit the park each year. Its budget for 2006 was $15.372 million.

3. How much rain does the Everglades National Park receive each year rounded to the nearest inch?

5. What is the average number of visitors rounded to the nearest hundredth of a million?

7. What is the budget to the nearest hundredth of a million?

4. What is the average number of visitors rounded to the nearest tenth of a million?

6. What is the budget to the nearest million?

8. What is the budget to the nearest tenth of a million?

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Multi-PartLesson 1

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Homework PracticeEstimate Sums and Differences

1. 5.30 + 1.76 + 4.079

3. 100.38 - 16.653

5. 3.81 + 4.491

7. 1.62 + 2.403 + 2.009

2. 2.341 - 1.51

4. 2.462 + 6.91 + 3.189

6. $6.46 + $5.50

8. $4.82 + $5.51 + $5.01

Estimate each sum or difference.

Use the lunch menu for Exercises 9 and 10. Show your work.

9. Malcolm buys a taco and milk. About how much money does he spend?

10. Catalina buys a salad and two hamburgers. About how much does she spend?

Round each decimal to the place indicated.

11. 6.1; ones

13. 0.069; hundredths

15. 1.708; hundredths

12. 9.23; tenths

14. 18.17; ones

16. 8.506; tenths

Lunch MenuItem PriceMilk $0.89

Hamburger $1.25Salad $0.95Taco $1.49

Pudding $0.70

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Multi-PartLesson 1

BPART Problem-Solving PracticeEstimate Sums and Differences

Solve. Show your work.

1. The road Sheryl takes to school is 29.76 miles long. Estimate the total distance Sheryl travels to and from school.

3. Elijah is 1.3 meters tall. His father is 1.9 meters tall. About how much taller is Elijah’s father?

5. Henry spent $27.38 on supplies for his new fish tank. He gave the cashier $30. About how much change did Henry get back?

7. Myron ran 12.6 miles on Tuesday and 15.3 miles on Thursday. About how many more miles did Myron run on Thursday than on Tuesday?

2. Mohammed walked 8.7 blocks to school and the same distance home. Estimate the total number of blocks he walked.

4. Bethany made purchases of $10.34 and $27.60 at the store. Estimate what she spent to the nearest dollar.

6. For his lawn-mowing service, Gaspar has three gasoline cans. One can contains 5.17 gallons of gasoline; one contains 4.96 gallons; and the third contains 4.23 gallons. To the nearest whole gallon, estimate the total amount of gasoline he has.

8. The distance from Ike’s house to the school is 3.4 miles. The distance from Ike’s house to the library is 5.8 miles. About how much farther is the library than the school from Ike’s house?

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Multi-PartLesson 1

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C Homework PracticeProblem-Solving Investigation: Estimate or Exact

For each problem, determine whether you need an estimate or an exact answer. Then solve.

1. It costs Marc $4.25 a day to feed his dog. About how much does it cost him to feed his dog for a year?

3. A bank puts $750 in each bag. How much are 15 bags worth?

5. When at rest, your heart probably beats about 70 times per minute. At that rate, about how many times does it beat in an hour?

2. In the past year, a grocery store deposited $60,000 worth of pennies, $150,000 worth of nickels, $400,000 worth of dimes, and $500,000 worth of quarters in the bank. What is the total value of the deposit?

4. If each vault contains $3,000, how much is in 3 vaults?

6. Ann bought two shirts for $28.95 each and a skirt for $33.95. The sales tax was $3.71. About how much did she pay altogether?

Estimate each sum or difference by rounding.

7. 5.2 + 2.1 8. 102.6 + 96.2

9. 40.1 + 10.2 10. 17.342 - 9.603

11. 189.98 - 74.26 12. 65.017 - 8.406

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Multi-PartLesson 2

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C Homework PracticeAdd Decimals

Add.

1. 1.546 + 0.07 2. 75.4 + 0.5919

3. $100.80 + $5.87 4. 3.72 + 6.0064

5. 0.802 + 0.4581 6. 4.3 + 0.1748

Solve.

7. Lorena bought groceries for $102.34 and new shoes for $53.36. How much did Lorena spend on groceries and shoes altogether?

8. The school is 3.2 blocks from Hector’s house. How many blocks does Hector walk to go to and from school?

For each problem, determine whether you need an estimate or an exact answer. Then solve.

9. Hunter School has kindergarten and grades 1 through 6. There are 2 kindergarten classes and 2 classes in each grade. If the maximum class size is 25, what is the greatest number of students that could be in the school?

10. It costs $0.58 to produce and mail a newsletter. Each week, 475,000 newsletters are mailed to subscribers. About how much does it cost to produce and mail the newsletter each month?

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Multi-PartLesson 2

CPART Problem-Solving PracticeAdd Decimals

Solve.

1. If Tabitha had 4.6 gallons of water in one bucket and 2.3 gallons in another bucket, how many gallons did she have altogether?

3. Last month, Shelly earned $15.38 for mowing lawns, $6.25 for cleaning her room, and $12.04 for other chores. How much did she earn last month?

5. Hailey added the number 4.576 to the number 9.2. Her answer was 15.596. Is this answer correct? If not, what is the correct answer?

7. Doreen has $20. She wants to buy a pair of earrings that cost $7.58 and a necklace that costs $13.36. Does Doreen have enough money? Explain your reasoning.

2. Micah had $10.52 after he left the book store. If he bought a book for $6.39, how much money did he have before he went to the book store?

4. Noah measured the length of three pieces of cloth. The measurements were 4.29 feet, 3.6 feet, and 2.34 feet. What was the total length of the three pieces of cloth?

6. Rocky bought one 4.5-pound bag of dog food for $3.89, a 7.5-pound bag of cat food for $6.69, and two 2.3-pound bags of birdseed for $1.89 each. How much did he pay for the animal food?

8. Marcos is happy because it has snowed in his town for three straight days. On Monday it snowed 3.56 inches. On Tuesday it snowed 4.359 more inches. On Wednesday it snowed 3.07 more inches. What was the total snowfall over the three days?

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Multi-PartLesson 2

DPART


Homework Practice Addition Properties

Use properties of addition to find each sum mentally. Show your steps and identify the properties that you used.

1. 9 + 31 + 6

2. 17 + 23 + 8

3. 12.5 + 1 + 43.5

For Exercises 4 and 5, find the value that makes each sentence true.

4. 33 + (76 + 5) = ( + 33) + 5 5. 13.8 + (9.9 + 4) = (9.9 + 4) +

Solve.

6. Sasha spent $1.05 on a soda, $5.25 on a sandwich, $0.75 on a piece of fruit, and $4.95 on a magazine. Use mental math to find the total amount she spent.

Add.

7. 13 + 9.25 =

9. 18.21 + 10.03 =

8. 7.41 + 1.3 =

10. 6.007 + 2.31 =

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Multi-PartLesson 2

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D Problem-Solving PracticeAddition Properties

Solve.

1. Jessie went to the mall and bought a CD for $12.98, a skirt for $17.50, a T-shirt for $8.50, and a bottle of water for $1.02. Use mental math to find the total amount she spent.

3. Mackenzie practices violin four days a week. One week, she practiced for 21, 39, 45, and 25 minutes. Use mental math to find the total amount of time she practiced.

5. Paula was reading a novel. She read 13 pages on Sunday, 12 pages on Tuesday, 17 pages on Friday, and 8 pages on Saturday. Use mental math to find the total number of pages she read.

2. Gary played soccer for 1 hour and tennis for 2 hours. Tanya played tennis for 2 hours and soccer for 1 hour. Who played sports longer? Explain.

4. Francis got the following scores on his math quizzes: 86, 84, 90. Jillian got the following scores on her math quizzes: 84, 90, 86. Overall, who scored better? Which addition property can you use to find the answer?

6. Dean received the following amounts for mowing his neighbors’ lawns: $12.50, $16.75, $20.50, $33.25. Use mental math to find the total amount he earned.

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Multi-PartLesson 3

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C Homework PracticeSubtract Decimals

Subtract.

1. 60 - 43.6 =

3. 38.61 - 5.04 =

5. 75 - 14.25 =

2. 18.31 - 8.25 =

4. 88.39 - 20.8 =

6. 12.64 - 7.3 =

7. Jabir buys 2.74 pounds of dried pinto beans and 4.05 pounds of dried lima beans. What is the difference between the weights of the beans that Jabir buys?

8. Rebekah’s baby brother weighs 7.71 pounds. Her newborn kitten weighs 0.24 pounds. How much more does Rebekah’s baby brother weigh than her kitten?

Add.

9. 0.7+ 2.4

12. 3.104+ 5.87

10. 0.81+ 0.27

13. 9.924+ 4.53

11. 3.65+ 5.6

14. 7.873+ 5.795

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Multi-PartLesson 3

CPART Problem-Solving PracticeSubtract Decimals

Solve.

1. Kamal buys a pen that costs $1.09 and a tablet of paper that costs $2.50. How much more does the paper cost than the pen?

3. Roberto hikes 21.48 miles on one weekend. The next weekend he hikes 30 miles. How much less is the distance he hiked on the first weekend than the distance he hiked on the second weekend?

5. Marshall compares water tanks at the home improvement store. One tank holds 20.2 gallons of water. A second tank holds 28.1 gallons of water. How much more water does the second tank hold than the first tank?

7. Layton and his brother measure their heights. Layton is 1.4 meters tall. His brother is 0.9 meter tall. How much taller is Layton than his brother?

2. During the first week of her vacation, Madison practices playing her flute 5.75 hours. In the following week, she spends 4.2 hours practicing the flute. What is the difference in the amount of time she spends practicing the flute during these weeks?

4. Heather earned $8.42 per hour during the first month of her new job. Then she got a raise and earned $9.08 per hour. What was the amount of her raise?

6. Cheyenne lives 576.54 feet above sea level. Her grandmother lives 408.6 feet above sea level. What is the difference in the elevations?

8. Clinton and his sister sell some of their toys at a garage sale. Clinton makes $12.94 at the sale, and his sister makes $20.18. How much less does Clinton make at the garage sale than his sister?

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Grade 5 • Add and Subtract Decimals


Homework PracticeProblem-Solving Strategy: Work Backward

Solve. Use the work backward strategy.

1. Ms. Houston’s fifth-grade class is going to a dinosaur park. The class raises $68 for the trip. Transportation to the park costs $40. The park sells small fossils for $4 each. How many fossils can they buy with the money they have left?

3. Tara had $15.65 left after a day at the mall. She spent $35 on a pair of running shoes, $12.50 on a shirt, and $3.85 on lunch. How much money did Tara have when she arrived at the mall?

2. The outdoor club went on a cross-country ski trip. Rentals for each person cost $4.50. Transportation for the group was $35. The total cost for rentals and transportation was $134. How many rentals did they pay for?

4. Kusuo’s baseball game begins at 5:00 P.M. Kusuo wants to arrive 45 minutes early to warm up. If it takes him half an hour to get to the baseball field, what time should Kusuo leave for the game?

Subtract.

5. 1.9- 1.2

8. 13.97 - 11.5

11. 6.32 - 1.8

6. 39.8- 20.1

9. 1.69 - 0.71

12. 36.5 - 23.4

7. 11.9

______ - 6.8

10. 42.38 - 21.28

13. 15.86 - 5.06

53

Multi-PartLesson 3

PART D

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