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Estimating Differences
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Estimating Differences
📚 Part 1: Multiple Choice (Estimate quickly)
1. Estimate 483 − 197 by rounding to the nearest ten. Which is best?
280
290
300
2. Estimate 6.5 − 2.38 to one decimal place.
4.1
4.12
3.9
3. Alex read 324 pages and Bea read 289 pages. Estimate how many more pages Alex read (nearest ten).
25 pages
30 pages
35 pages
4. A TV is $899 and a soundbar is $165. Estimate the price difference by rounding to the nearest hundred.
$700
$734
$720
✏️ Part 2: Short Answers & Reasoning
5. Use front-end estimation for 7,642 − 3,198. Show your estimate and explain your steps.
6. Quick check: Estimate 52.7 − 18.39. Is the exact answer 34.31 reasonable? Circle one.
Yes — it is reasonable
No — it is not reasonable
7. Match each subtraction pair (round both numbers to the nearest whole number, then estimate the difference).
A. 14.6 − 8.2
B. 102.3 − 47.9
C. 5.95 − 2.48
1) 7
2) 54
3) 4
8. Challenge: Which estimation strategy would you choose for 9,872 − 4,289 (rounding both numbers, front-end, or adjust-after-rounding)? Explain in one sentence.
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