Estimating Sums Worksheet
Practice estimating sums to the nearest ten and hundred for third graders.
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Estimating Sums
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Read each question carefully and follow the instructions to estimate the sums.
Round each number to the nearest ten, then estimate the sum.
1. 32 + 57 ≈
2. 18 + 73 ≈
3. 45 + 21 ≈
4. 66 + 13 ≈
Use the number line to help you round 47 to the nearest ten. Then estimate the sum of 47 + 23.
47 rounded to the nearest ten is:
23 rounded to the nearest ten is:
Estimated sum:
Round each number to the nearest hundred, then estimate the sum.
1. 123 + 487 ≈
2. 350 + 210 ≈
3. 789 + 105 ≈
4. 532 + 399 ≈
1. Which of the following is the best estimate for 28 + 61?
80
90
100
70
Determine if the following statements are true or false.
1. The estimated sum of 145 + 321 is 500 when rounding to the nearest hundred.
True
False
Sarah has 218 stickers, and Tom has 375 stickers. Estimate the total number of stickers they have by rounding each number to the nearest hundred.