3rd Grade Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 2 — Answers
Answer sheet with worked solutions for the 3rd Grade place value worksheet.
Success TutoringWorksheetsAnswer sheet3rd Grade · Mathematics · Place Value3rd Grade Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 231 + 427 by rounding each number to the nearest 100.
Answer: 600
- 231 rounds to 200; 427 rounds to 400
- 200 + 400 = 600
The exact answer is 658, close to the estimate.
2.Estimate 62 × 4 by rounding 62 to the nearest 10.
Answer: 240
- 62 rounds to 60
- 60 × 4 = 240
The exact answer is 248.
3.Estimate 477 − 414 by rounding each number to the nearest 100.
Answer: 100
- 477 rounds to 500; 414 rounds to 400
- 500 − 400 = 100
The exact answer is 63, close to the estimate.
4.Estimate 82 × 4 by rounding 82 to the nearest 10.
Answer: 320
- 82 rounds to 80
- 80 × 4 = 320
The exact answer is 328.
5.Estimate 764 − 315 by rounding each number to the nearest 100.
Answer: 500
- 764 rounds to 800; 315 rounds to 300
- 800 − 300 = 500
The exact answer is 449, close to the estimate.
6.Estimate 43 × 7 by rounding 43 to the nearest 10.
Answer: 280
- 43 rounds to 40
- 40 × 7 = 280
The exact answer is 301.
7.Estimate 760 − 458 by rounding each number to the nearest 100.
Answer: 300
- 760 rounds to 800; 458 rounds to 500
- 800 − 500 = 300
The exact answer is 302, close to the estimate.
8.Estimate 27 × 9 by rounding 27 to the nearest 10.
Answer: 270
- 27 rounds to 30
- 30 × 9 = 270
The exact answer is 243.
9.Estimate 938 − 334 by rounding each number to the nearest 100.
Answer: 600
- 938 rounds to 900; 334 rounds to 300
- 900 − 300 = 600
The exact answer is 604, close to the estimate.
10.Estimate 94 × 4 by rounding 94 to the nearest 10.
Answer: 360
- 94 rounds to 90
- 90 × 4 = 360
The exact answer is 376.
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.