Year 3 Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 3 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 3 · Mathematics · Place ValueYear 3 Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 95 − 93 by rounding each number to the nearest 10.
Answer: 10
- 95 rounds to 100; 93 rounds to 90
- 100 − 90 = 10
The exact answer is 2, close to the estimate.
2.Estimate 39 + 92 by rounding each number to the nearest 10.
Answer: 130
- 39 rounds to 40; 92 rounds to 90
- 40 + 90 = 130
The exact answer is 131, close to the estimate.
3.Estimate 41 + 56 by rounding each number to the nearest 10.
Answer: 100
- 41 rounds to 40; 56 rounds to 60
- 40 + 60 = 100
The exact answer is 97, close to the estimate.
4.Estimate 85 + 65 by rounding each number to the nearest 10.
Answer: 160
- 85 rounds to 90; 65 rounds to 70
- 90 + 70 = 160
The exact answer is 150, close to the estimate.
5.Estimate 74 + 72 by rounding each number to the nearest 10.
Answer: 140
- 74 rounds to 70; 72 rounds to 70
- 70 + 70 = 140
The exact answer is 146, close to the estimate.
6.Estimate 96 + 82 by rounding each number to the nearest 10.
Answer: 180
- 96 rounds to 100; 82 rounds to 80
- 100 + 80 = 180
The exact answer is 178, close to the estimate.
7.Estimate 43 − 28 by rounding each number to the nearest 10.
Answer: 10
- 43 rounds to 40; 28 rounds to 30
- 40 − 30 = 10
The exact answer is 15, close to the estimate.
8.Estimate 78 − 11 by rounding each number to the nearest 10.
Answer: 70
- 78 rounds to 80; 11 rounds to 10
- 80 − 10 = 70
The exact answer is 67, close to the estimate.
9.Estimate 64 − 44 by rounding each number to the nearest 10.
Answer: 20
- 64 rounds to 60; 44 rounds to 40
- 60 − 40 = 20
The exact answer is 20, close to the estimate.
10.Estimate 97 − 71 by rounding each number to the nearest 10.
Answer: 30
- 97 rounds to 100; 71 rounds to 70
- 100 − 70 = 30
The exact answer is 26, 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.