Name:    Lesson 6: Estimating Differences

True/False
Indicate whether the statement is true or false.

1.

Karli was estimating the difference for the following number sentence: 4567 - 2144
Karli decided that the answer to her sentence should be about 2500.

2.

Julia estimated the following number sentence 8511 - 4211 to be close to 4500.  Here is how she got her answer:
“I rounded 8511 to 8500, and 4211 to 4200.”

3.

Vera estimates that 317 + ___ = 4899.  She estimated the missing number to be close to 4600.  Here is what Vera said:
“The answer will be close to 4600 because if I round 4899 to 4900 and 317 to 300, I then subtract 300 from 4900.”

4.

2998 + ___ = 4000
The missing number will be close to 1000.

5.

7988 - ___ = 5878.
The missing number will be close to 1000.

Multiple Choice
Identify the choice that best completes the statement or answers the question.

6.

Use estimation strategies to help you to estimate each of the following differences.
4663 - 2133
 a. 2000 b. 2600 c. 3000 d. 3500

7.

Estimate the difference.
4366 - 1112
 a. 3300 b. 4000 c. 2000 d. 2800

8.

Estimate the difference.
9543 - 6789
 a. 4000 b. 4500 c. 3500 d. 2700

9.

Estimate the difference.
8952 - 3511
 a. 5500 b. 3000 c. 4500 d. 2500

10.

Leo went to the store and bought a jacket that cost \$249.  He gave the clerk \$300.  About how much change did Leo receive back?
 a. \$20 b. \$30 c. \$40 d. \$50