Estimating Sums Worksheet
A Grade 8 math worksheet focusing on estimating sums of whole numbers, decimals, and fractions using various rounding strategies.
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Standards
Topics
Estimating Sums
Name:
Date:
Score:
Read each question carefully. Estimate the sums using the specified rounding method or a suitable method of your choice. Show your work where requested.
1. Estimate the sum of 4,789 + 2,112 by rounding each number to the nearest thousand.
6,000
7,000
6,900
7,100
2. Which is the best estimate for 15.8 + 3.1 + 8.9 by rounding to the nearest whole number?
27
28
29
30
3. When estimating the sum of 124 + 379 by rounding to the nearest hundred, the estimated sum is .
4. To estimate the sum of 7.23 + 4.89 + 1.12 by rounding to the nearest whole number, you would round the numbers to , , and . The estimated sum is .
5. A student rounded 345 to 300 and 678 to 700 to estimate their sum. Explain if this was an appropriate rounding strategy and why.
6. Estimate the sum of 1/3 + 5/6 + 7/8. Explain your strategy.
7. Rounding 1,450 to the nearest thousand gives 1,000.
True
False
8. When estimating 0.98 + 0.05, rounding to the nearest tenth gives an estimated sum of 1.1.
True
False
9. Use the number line below to estimate the sum of 2.3 + 1.8 by rounding each number to the nearest whole number. Mark the rounded numbers and their estimated sum on the number line.
10. Estimate the sum of 17.6 + 32.1 by rounding to the nearest ten. Show your work.
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