Year 5 Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 2 — Answers
Answer sheet with worked solutions for the Year 5 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 5 · Mathematics · Place ValueYear 5 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 95 − 51 by rounding each number to the nearest 10.
Answer: 50
- 95 rounds to 100; 51 rounds to 50
- 100 − 50 = 50
The exact answer is 44, close to the estimate.
2.Estimate 77 − 12 by rounding each number to the nearest 10.
Answer: 70
- 77 rounds to 80; 12 rounds to 10
- 80 − 10 = 70
The exact answer is 65, close to the estimate.
3.Estimate 69 − 48 by rounding each number to the nearest 10.
Answer: 20
- 69 rounds to 70; 48 rounds to 50
- 70 − 50 = 20
The exact answer is 21, close to the estimate.
4.Estimate 66 − 11 by rounding each number to the nearest 10.
Answer: 60
- 66 rounds to 70; 11 rounds to 10
- 70 − 10 = 60
The exact answer is 55, close to the estimate.
5.Estimate 54 − 18 by rounding each number to the nearest 10.
Answer: 30
- 54 rounds to 50; 18 rounds to 20
- 50 − 20 = 30
The exact answer is 36, close to the estimate.
6.Estimate 98 − 82 by rounding each number to the nearest 10.
Answer: 20
- 98 rounds to 100; 82 rounds to 80
- 100 − 80 = 20
The exact answer is 16, close to the estimate.
7.Estimate 51 + 92 by rounding each number to the nearest 10.
Answer: 140
- 51 rounds to 50; 92 rounds to 90
- 50 + 90 = 140
The exact answer is 143, close to the estimate.
8.Estimate 86 − 73 by rounding each number to the nearest 10.
Answer: 20
- 86 rounds to 90; 73 rounds to 70
- 90 − 70 = 20
The exact answer is 13, close to the estimate.
9.Estimate 87 + 25 by rounding each number to the nearest 10.
Answer: 120
- 87 rounds to 90; 25 rounds to 30
- 90 + 30 = 120
The exact answer is 112, close to the estimate.
10.Estimate 95 + 84 by rounding each number to the nearest 10.
Answer: 180
- 95 rounds to 100; 84 rounds to 80
- 100 + 80 = 180
The exact answer is 179, 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.