Estimating Sums Worksheet
Practice estimating sums of whole numbers and decimals to the nearest ten, hundred, thousand, or whole number.
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Estimating Sums
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Date:
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Read each question carefully and estimate the sum by rounding the numbers as instructed. Show your work.
1. Estimate the sum of 47 + 82 by rounding each number to the nearest ten.
47 rounded to the nearest ten is .
82 rounded to the nearest ten is .
Estimated sum:
2. Estimate the sum of 123 + 387 by rounding each number to the nearest hundred.
123 rounded to the nearest hundred is .
387 rounded to the nearest hundred is .
Estimated sum:
3. Estimate the sum of 5.6 + 3.2 by rounding each number to the nearest whole number.
4. Estimate the sum of 12.85 + 7.15 by rounding each number to the nearest whole number.
5. When estimating the sum of 23 + 68 to the nearest ten, the estimated sum is 90.
True
False
6. The estimated sum of 4.9 + 7.2, rounded to the nearest whole number, is 13.
True
False
7. Which of the following is the best estimate for the sum of 189 + 312 by rounding to the nearest hundred?
400
500
600
700
8. A grocery store sold 345 apples and 261 oranges. About how many fruits were sold in total, rounding to the nearest ten?
500
600
610
620
9. Sarah has $14.75 and John has $28.30. Estimate how much money they have altogether by rounding each amount to the nearest dollar.
10. A school ordered 789 pencils and 412 erasers. Approximately how many writing supplies did they order in total, rounding to the nearest hundred?