Year 5 Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 3 — 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 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 77 − 63 by rounding each number to the nearest 10.
Answer: 20
- 77 rounds to 80; 63 rounds to 60
- 80 − 60 = 20
The exact answer is 14, close to the estimate.
2.Estimate 79 − 55 by rounding each number to the nearest 10.
Answer: 20
- 79 rounds to 80; 55 rounds to 60
- 80 − 60 = 20
The exact answer is 24, close to the estimate.
3.Estimate 73 − 48 by rounding each number to the nearest 10.
Answer: 20
- 73 rounds to 70; 48 rounds to 50
- 70 − 50 = 20
The exact answer is 25, close to the estimate.
4.Estimate 64 + 69 by rounding each number to the nearest 10.
Answer: 130
- 64 rounds to 60; 69 rounds to 70
- 60 + 70 = 130
The exact answer is 133, close to the estimate.
5.Estimate 67 − 58 by rounding each number to the nearest 10.
Answer: 10
- 67 rounds to 70; 58 rounds to 60
- 70 − 60 = 10
The exact answer is 9, close to the estimate.
6.Estimate 82 − 33 by rounding each number to the nearest 10.
Answer: 50
- 82 rounds to 80; 33 rounds to 30
- 80 − 30 = 50
The exact answer is 49, close to the estimate.
7.Estimate 69 − 15 by rounding each number to the nearest 10.
Answer: 50
- 69 rounds to 70; 15 rounds to 20
- 70 − 20 = 50
The exact answer is 54, close to the estimate.
8.Estimate 85 + 71 by rounding each number to the nearest 10.
Answer: 160
- 85 rounds to 90; 71 rounds to 70
- 90 + 70 = 160
The exact answer is 156, close to the estimate.
9.Estimate 96 − 12 by rounding each number to the nearest 10.
Answer: 90
- 96 rounds to 100; 12 rounds to 10
- 100 − 10 = 90
The exact answer is 84, close to the estimate.
10.Estimate 82 − 71 by rounding each number to the nearest 10.
Answer: 10
- 82 rounds to 80; 71 rounds to 70
- 80 − 70 = 10
The exact answer is 11, 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.