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 52 − 34 by rounding each number to the nearest 10.
Answer: 20
- 52 rounds to 50; 34 rounds to 30
- 50 − 30 = 20
The exact answer is 18, close to the estimate.
2.Estimate 82 − 59 by rounding each number to the nearest 10.
Answer: 20
- 82 rounds to 80; 59 rounds to 60
- 80 − 60 = 20
The exact answer is 23, close to the estimate.
3.Estimate 54 − 17 by rounding each number to the nearest 10.
Answer: 30
- 54 rounds to 50; 17 rounds to 20
- 50 − 20 = 30
The exact answer is 37, close to the estimate.
4.Estimate 32 + 17 by rounding each number to the nearest 10.
Answer: 50
- 32 rounds to 30; 17 rounds to 20
- 30 + 20 = 50
The exact answer is 49, close to the estimate.
5.Estimate 27 + 42 by rounding each number to the nearest 10.
Answer: 70
- 27 rounds to 30; 42 rounds to 40
- 30 + 40 = 70
The exact answer is 69, close to the estimate.
6.Estimate 98 + 72 by rounding each number to the nearest 10.
Answer: 170
- 98 rounds to 100; 72 rounds to 70
- 100 + 70 = 170
The exact answer is 170, close to the estimate.
7.Estimate 57 + 56 by rounding each number to the nearest 10.
Answer: 120
- 57 rounds to 60; 56 rounds to 60
- 60 + 60 = 120
The exact answer is 113, close to the estimate.
8.Estimate 61 + 15 by rounding each number to the nearest 10.
Answer: 80
- 61 rounds to 60; 15 rounds to 20
- 60 + 20 = 80
The exact answer is 76, close to the estimate.
9.Estimate 31 − 14 by rounding each number to the nearest 10.
Answer: 20
- 31 rounds to 30; 14 rounds to 10
- 30 − 10 = 20
The exact answer is 17, close to the estimate.
10.Estimate 87 − 61 by rounding each number to the nearest 10.
Answer: 30
- 87 rounds to 90; 61 rounds to 60
- 90 − 60 = 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.