Year 3 Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 2 — 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 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 38 + 36 by rounding each number to the nearest 10.
Answer: 80
- 38 rounds to 40; 36 rounds to 40
- 40 + 40 = 80
The exact answer is 74, close to the estimate.
2.Estimate 26 + 58 by rounding each number to the nearest 10.
Answer: 90
- 26 rounds to 30; 58 rounds to 60
- 30 + 60 = 90
The exact answer is 84, close to the estimate.
3.Estimate 88 + 34 by rounding each number to the nearest 10.
Answer: 120
- 88 rounds to 90; 34 rounds to 30
- 90 + 30 = 120
The exact answer is 122, close to the estimate.
4.Estimate 51 + 78 by rounding each number to the nearest 10.
Answer: 130
- 51 rounds to 50; 78 rounds to 80
- 50 + 80 = 130
The exact answer is 129, close to the estimate.
5.Estimate 95 − 67 by rounding each number to the nearest 10.
Answer: 30
- 95 rounds to 100; 67 rounds to 70
- 100 − 70 = 30
The exact answer is 28, close to the estimate.
6.Estimate 47 − 44 by rounding each number to the nearest 10.
Answer: 10
- 47 rounds to 50; 44 rounds to 40
- 50 − 40 = 10
The exact answer is 3, close to the estimate.
7.Estimate 95 − 86 by rounding each number to the nearest 10.
Answer: 10
- 95 rounds to 100; 86 rounds to 90
- 100 − 90 = 10
The exact answer is 9, close to the estimate.
8.Estimate 25 + 64 by rounding each number to the nearest 10.
Answer: 90
- 25 rounds to 30; 64 rounds to 60
- 30 + 60 = 90
The exact answer is 89, close to the estimate.
9.Estimate 57 − 49 by rounding each number to the nearest 10.
Answer: 10
- 57 rounds to 60; 49 rounds to 50
- 60 − 50 = 10
The exact answer is 8, close to the estimate.
10.Estimate 56 + 53 by rounding each number to the nearest 10.
Answer: 110
- 56 rounds to 60; 53 rounds to 50
- 60 + 50 = 110
The exact answer is 109, 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.