Five-Minute Check (over Lesson 10–5)

Main Idea

Example 1:Estimate Sums

Example 2:Estimate Differences

Example 3:Real-World Example

Example 4:Real-World Example

• I will estimate sums and differences of mixed numbers.

Estimate Sums

Estimate 2 + 3 .46

16

2 46

3 16

+

Estimate 3 + 3 = 6

Answer: So, 2 + 3 is about 6.46

16

1. A

2. B

3. C

4. D0% 0%0%0%

A. 4

B. 5

C. 6

D. 7

Estimate 4 + 1 .23

15

Estimate Differences

Estimate 8 – 3 .38

78

8 38

3 78

–

Estimate 8 – 4 = 4

Answer: So, 8 – 3 is about 4.38

78

1. A

2. B

3. C

4. D0% 0%0%0%

Estimate 9 – 6 .78

18

A. 4

B. 5

C. 6

D. 7

Round each mixed number to the nearest whole number. Then add.

Javier walked 2 miles on Saturday and

1 miles on Sunday. About how many

miles did he walk in all?

610

710

2 610

1 710

+

Estimate 3 + 2 = 5

Answer: So, Javier walked about 5 miles.

1. A

2. B

3. C

4. D0% 0%0%0%

Clairese walked for 1 hours on Friday and

2 hours on Sunday. About how many

hours did she walk in all?

45

15

A. about 1 hour

B. about 2 hours

C. about 3 hours

D. about 4 hours

A punch recipe calls for 9 cups of juice. Angie

has used 6 cups of juice in the mixture. About

how much more juice does Angie need to finish

making the punch?

23

26

Round 9 to 10 and 6 to 6.23

26

Estimate 10 – 6 = 4.

Answer: So, about 4 more cups of juice are needed to finish making the punch.

1. A

2. B

3. C

4. D0% 0%0%0%

A recipe calls for 8 cups of water. If only

4 cups has been added in so far, about

how much more is needed?

17

56

A. about 2 cups

B. about 3 cups

C. about 4 cups

D. about 5 cups

End of the Lesson

Five-Minute Check (over Lesson 10–5)

Image Bank

Math Tool Chest

Add Like Fractions

1. A

2. B

3. C

4. D

0% 0%0%0%

(over Lesson 10–5)

Solve. Determine which answer is reasonable. Ali bought lunch at a restaurant. She spent $5.75 for a sandwich, $1.99 for a cup of soup, and $1.29 for milk. Which is a more reasonable estimate for the amount of money Ali spent on lunch?

A. $10.00

B. $11.00

C. $9.00

D. $8.00