3rd Grade Estimating Sums, Differences and Products Worksheet — Level 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 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 704 + 914 by rounding each number to the nearest 100.
Answer: 1,600
- 704 rounds to 700; 914 rounds to 900
- 700 + 900 = 1,600
The exact answer is 1,618, close to the estimate.
2.Estimate 45 × 4 by rounding 45 to the nearest 10.
Answer: 200
- 45 rounds to 50
- 50 × 4 = 200
The exact answer is 180.
3.Estimate 650 − 497 by rounding each number to the nearest 100.
Answer: 200
- 650 rounds to 700; 497 rounds to 500
- 700 − 500 = 200
The exact answer is 153, close to the estimate.
4.Estimate 81 × 6 by rounding 81 to the nearest 10.
Answer: 480
- 81 rounds to 80
- 80 × 6 = 480
The exact answer is 486.
5.Estimate 990 + 217 by rounding each number to the nearest 100.
Answer: 1,200
- 990 rounds to 1,000; 217 rounds to 200
- 1,000 + 200 = 1,200
The exact answer is 1,207, close to the estimate.
6.Estimate 59 × 6 by rounding 59 to the nearest 10.
Answer: 360
- 59 rounds to 60
- 60 × 6 = 360
The exact answer is 354.
7.Estimate 167 + 974 by rounding each number to the nearest 100.
Answer: 1,200
- 167 rounds to 200; 974 rounds to 1,000
- 200 + 1,000 = 1,200
The exact answer is 1,141, close to the estimate.
8.Estimate 67 × 3 by rounding 67 to the nearest 10.
Answer: 210
- 67 rounds to 70
- 70 × 3 = 210
The exact answer is 201.
9.Estimate 844 − 191 by rounding each number to the nearest 100.
Answer: 600
- 844 rounds to 800; 191 rounds to 200
- 800 − 200 = 600
The exact answer is 653, close to the estimate.
10.Estimate 92 × 8 by rounding 92 to the nearest 10.
Answer: 720
- 92 rounds to 90
- 90 × 8 = 720
The exact answer is 736.
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.
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