Estimating Sums Worksheet
Practice estimating sums of whole numbers and decimals to the nearest ten, hundred, or whole number.
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Estimating Sums
Name:
Date:
Score:
Read each question carefully and follow the instructions to estimate the sums. Show your work where indicated.
Estimate the sum by rounding each number to the nearest ten.
1. 43 + 78 ≈ + =
2. 124 + 59 ≈ + =
3. 367 + 212 ≈ + =
Estimate the sum by rounding each number to the nearest hundred. Show your rounded numbers.
4. 589 + 321
5. 1450 + 760
6. Estimate the sum of 12.7 + 8.3 by rounding each number to the nearest whole number.
20
21
22
23
Determine if the following statements are True or False.
7. When estimating 245 + 382 to the nearest hundred, the estimated sum is 600.
True
False
8. Sarah bought a book for $14.85 and a pen for $3.20. Estimate the total cost of her purchases to the nearest dollar.
9. Use the number line to help estimate the sum of 18 + 32. Round each number to the nearest ten.
First, round 18 to the nearest ten:
Then, round 32 to the nearest ten:
Estimated sum:
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