Envision Grade 5 - Topic 2 Review

Vocabulary

100

The answer to an addition problem.

The answer to a subtraction problem.

Sum and Difference

200

The property that lets you add two decimals in any order.

Commutative Property

300

Numbers that are easy to add, subtract, multiply, and divide mentally. 

Compatible Numbers

400

The properties that lets you change the groupings of the addends.

Associative Property

500

A mental math strategy that involves changing the number in an equation to make it easier to solve, while still keeping the equation balanced. 

Compensation

Subtracting Decimals

100

5.58 - 2.43 = ?

3.15

200

11.26 - 7.8 = ?

3.46

300

$56.98 - $28.99 = ?

$27.99

400

What decimal makes this equation true?

4.67 + ____ = 12.37

7.70

500

What decimal makes this statement true?

86.39 + ______ = 198.23

111.84

Adding Decimals

100

3.52 + 7.14 = ?

10.66

200

13.21 + 29.7 = 

42.91

300

$3.90 + $12.99 + $41.20 = ?

$58.09

400

15.9 + 26.29 + 43 = ? 

85.19

500

$100 + $65.90 + $203.97 + $43

$412.87

Estimating Sums and Differences

100

Estimate the sum of 12.39 and 8.96 by rounding each number to the nearest whole number.

21

200

Estimate the difference between 27.9 and 16.93 by rounding each number to the nearest whole number.

11

300

Estimate the sum of 29.49 and 13.82 by rounding each number to the nearest tenth.

43.3

400

Estimate the difference of 43.72 and 38.26 by rounding each number to the nearest tenth. 

5.4

500

The lengths of three pieces of ribbon are 3.08 cm, 12.34 cm, and 5.89 cm. What is the estimated total length if you round each number to the nearest tenth?  

21.3 cm

Word Problems with Decimals

100

At the grocery story, Lily bought a box of cereal for $3.78 and a gallon of milk for $4.50. How much money did she spend in all?

$8.28

200

Eric found a pair of sneakers for $85.60. He has a coupon for $7.50 off a pair of sneakers. How much money will Eric pay for the sneakers after his coupon?

$78.10

300

Henry has three toy cars with different lengths. The red car is 6.79 cm, the blue is 3.2 cm, and the yellow is 12.32 cm. 

1. What is the combined lengths of the cars?

2. How much longer is the yellow car than the blue car?

1. 22.31 cm

2. 9.12 cm longer

400

At the book fair, Natalie spent $12.78 on a book and $8.99 on highlighters.

1. What is the total amount she spent at the book fair?

2. If she paid with a $50 bill, how much change would she get?

1. $21.77

2. $28.23

500

A bathroom is 40.36 feet long and 29.27 feet wide.

1. Round the width and the length to the nearest whole number. Then estimate the perimeter of the bathroom.

2. Round the width and the length to the nearest tenth. Then estimate the perimeter of the bathroom.

3. Find the actual perimeter. Which estimate is closer to the actual perimeter

1. 138 feet

2. 139.4 feet

3. 139.26; Rounding to the tenths