Estimating Differences
Practice estimating differences between two-digit and three-digit numbers by rounding to the nearest ten or hundred.
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Estimating Differences
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Date:
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Read each question carefully and follow the instructions. Remember to estimate by rounding to the nearest ten or hundred before finding the difference.
Round each number to the nearest ten, then estimate the difference.
1. 78 - 23 ≈ - =
2. 54 - 19 ≈ - =
3. 91 - 37 ≈ - =
4. 65 - 42 ≈ - =
Use the number line to help you round each number to the nearest ten, then estimate the difference.
5. Estimate 67 - 21.
Rounded 67 to:
Rounded 21 to:
Estimated difference:
6. Estimate 83 - 48.
Rounded 83 to:
Rounded 48 to:
Estimated difference:
Choose the best estimate for each difference by rounding to the nearest hundred.
7. 492 - 105
300
400
500
600
8. 715 - 389
300
400
500
600
Tell whether each statement is True or False.
9. The estimated difference of 56 - 12 (rounded to the nearest ten) is 50.
True
False
10. To estimate 329 - 187, you would round 329 to 300 and 187 to 200.
True
False
Read each word problem, then estimate the difference to solve.
11. A library has 275 fiction books and 132 non-fiction books. About how many more fiction books are there than non-fiction books? (Round to the nearest hundred)
12. Sarah has 82 stickers, and Tom has 39 stickers. About how many more stickers does Sarah have than Tom? (Round to the nearest ten)