Estimating Differences
Practice estimating differences between numbers using rounding and compatible numbers for 7th graders.
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Estimating Differences
Name:
Date:
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Read each question carefully and follow the instructions to estimate the differences. Show your work where requested.
Estimate the difference by rounding each number to the nearest ten.
1. 87 - 32 ≈
2. 143 - 78 ≈
3. 219 - 91 ≈
Estimate the difference by rounding each number to the nearest hundred. Select the best answer.
4. 567 - 231
300
400
350
200
5. 892 - 405
500
400
490
600
Estimate the difference using compatible numbers. Explain your reasoning.
6. 493 - 108
7. 721 - 395
Determine if the following statements are true or false.
8. Estimating 678 - 345 by rounding to the nearest hundred gives an answer of 300.
True
False
9. When estimating differences, rounding to a larger place value (e.g., thousands instead of hundreds) usually results in a more precise estimate.
True
False
Solve the following word problems by estimating the difference.
10. A library has 1,289 fiction books and 734 non-fiction books. Approximately how many more fiction books are there than non-fiction books?
11. Sarah saved $452, and Mark saved $198. About how much more money did Sarah save than Mark?
Use the number line to help you estimate the difference between 92 and 37 by rounding to the nearest ten.
12. Estimated difference: