3rd Grade Estimating Sums, Differences and Products Worksheet — Level 1 — 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 1 — Practice Set 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 92 + 94 by rounding each number to the nearest 10.
Answer: 180
- 92 rounds to 90; 94 rounds to 90
- 90 + 90 = 180
The exact answer is 186, close to the estimate.
2.Estimate 74 + 11 by rounding each number to the nearest 10.
Answer: 80
- 74 rounds to 70; 11 rounds to 10
- 70 + 10 = 80
The exact answer is 85, close to the estimate.
3.Estimate 98 + 27 by rounding each number to the nearest 10.
Answer: 130
- 98 rounds to 100; 27 rounds to 30
- 100 + 30 = 130
The exact answer is 125, close to the estimate.
4.Estimate 88 − 23 by rounding each number to the nearest 10.
Answer: 70
- 88 rounds to 90; 23 rounds to 20
- 90 − 20 = 70
The exact answer is 65, close to the estimate.
5.Estimate 24 + 87 by rounding each number to the nearest 10.
Answer: 110
- 24 rounds to 20; 87 rounds to 90
- 20 + 90 = 110
The exact answer is 111, close to the estimate.
6.Estimate 94 − 62 by rounding each number to the nearest 10.
Answer: 30
- 94 rounds to 90; 62 rounds to 60
- 90 − 60 = 30
The exact answer is 32, close to the estimate.
7.Estimate 15 − 11 by rounding each number to the nearest 10.
Answer: 10
- 15 rounds to 20; 11 rounds to 10
- 20 − 10 = 10
The exact answer is 4, close to the estimate.
8.Estimate 45 − 31 by rounding each number to the nearest 10.
Answer: 20
- 45 rounds to 50; 31 rounds to 30
- 50 − 30 = 20
The exact answer is 14, close to the estimate.
9.Estimate 71 + 71 by rounding each number to the nearest 10.
Answer: 140
- 71 rounds to 70; 71 rounds to 70
- 70 + 70 = 140
The exact answer is 142, close to the estimate.
10.Estimate 85 − 39 by rounding each number to the nearest 10.
Answer: 50
- 85 rounds to 90; 39 rounds to 40
- 90 − 40 = 50
The exact answer is 46, close to the estimate.
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.