Name:    Lesson 2: Estimating Sums

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

1.

If I had the question, 3499 + 5321, I can estimate the sum. I would round 3499 to 3500, and 5321 to 5300. The estimated sum would be 7800.

2.

If I had the question 4789 + 3211, I can estimate the sum.  I would round 4789 to 4800 and 3211 to 3200. The estimated sum would be 8000.

3.

Karli estimated the following:  5699 + 3421.
“I estimated by rounding.  I rounded 5699 to 6000 and 3421 to 3000.  My estimated sum is 9000.”
To improve Karli’s estimate, she could round to the nearest hundred instead.

4.

Sydnie estimated that 5677 + 2999 to be 8700. Syndie got her estimate by rounding to the nearest thousand.

5.

Landen estimated that 2133 + 7891 = 10 000.
Landen got his estimate by rounding 2133 to 2100 and 7891 to 7900.

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

6.

Estimate the following sum.
1234 + 6711
 a. 7900 b. 8500 c. 9000 d. 9700

7.

Estimate the following sum.
4999 + 3001
 a. 6000 b. 7000 c. 8000 d. 9000

8.

Estimate the following sum.
478 + 5600
 a. 5000 b. 5500 c. 6000 d. 6500

9.

Estimate the following sum.
2399 + 2799
 a. 3800 b. 4200 c. 4800 d. 5200

10.

Estimate the following sum.
8780 + 1113
 a. 8500 b. 9000 c. 9500 d. 9900