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 48 + 58 by rounding each number to the nearest 10.
Answer: 110
- 48 rounds to 50; 58 rounds to 60
- 50 + 60 = 110
The exact answer is 106, close to the estimate.
2.Estimate 93 + 45 by rounding each number to the nearest 10.
Answer: 140
- 93 rounds to 90; 45 rounds to 50
- 90 + 50 = 140
The exact answer is 138, close to the estimate.
3.Estimate 55 − 34 by rounding each number to the nearest 10.
Answer: 30
- 55 rounds to 60; 34 rounds to 30
- 60 − 30 = 30
The exact answer is 21, close to the estimate.
4.Estimate 36 − 18 by rounding each number to the nearest 10.
Answer: 20
- 36 rounds to 40; 18 rounds to 20
- 40 − 20 = 20
The exact answer is 18, close to the estimate.
5.Estimate 89 − 14 by rounding each number to the nearest 10.
Answer: 80
- 89 rounds to 90; 14 rounds to 10
- 90 − 10 = 80
The exact answer is 75, close to the estimate.
6.Estimate 91 − 32 by rounding each number to the nearest 10.
Answer: 60
- 91 rounds to 90; 32 rounds to 30
- 90 − 30 = 60
The exact answer is 59, close to the estimate.
7.Estimate 87 − 38 by rounding each number to the nearest 10.
Answer: 50
- 87 rounds to 90; 38 rounds to 40
- 90 − 40 = 50
The exact answer is 49, close to the estimate.
8.Estimate 22 + 45 by rounding each number to the nearest 10.
Answer: 70
- 22 rounds to 20; 45 rounds to 50
- 20 + 50 = 70
The exact answer is 67, close to the estimate.
9.Estimate 41 + 53 by rounding each number to the nearest 10.
Answer: 90
- 41 rounds to 40; 53 rounds to 50
- 40 + 50 = 90
The exact answer is 94, close to the estimate.
10.Estimate 51 − 29 by rounding each number to the nearest 10.
Answer: 20
- 51 rounds to 50; 29 rounds to 30
- 50 − 30 = 20
The exact answer is 22, 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.