Year 5 Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 4 — 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 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 83 − 56 by rounding each number to the nearest 10.
Answer: 20
- 83 rounds to 80; 56 rounds to 60
- 80 − 60 = 20
The exact answer is 27, close to the estimate.
2.Estimate 17 + 59 by rounding each number to the nearest 10.
Answer: 80
- 17 rounds to 20; 59 rounds to 60
- 20 + 60 = 80
The exact answer is 76, close to the estimate.
3.Estimate 96 − 93 by rounding each number to the nearest 10.
Answer: 10
- 96 rounds to 100; 93 rounds to 90
- 100 − 90 = 10
The exact answer is 3, close to the estimate.
4.Estimate 84 − 31 by rounding each number to the nearest 10.
Answer: 50
- 84 rounds to 80; 31 rounds to 30
- 80 − 30 = 50
The exact answer is 53, close to the estimate.
5.Estimate 54 − 27 by rounding each number to the nearest 10.
Answer: 20
- 54 rounds to 50; 27 rounds to 30
- 50 − 30 = 20
The exact answer is 27, close to the estimate.
6.Estimate 87 − 32 by rounding each number to the nearest 10.
Answer: 60
- 87 rounds to 90; 32 rounds to 30
- 90 − 30 = 60
The exact answer is 55, close to the estimate.
7.Estimate 58 − 36 by rounding each number to the nearest 10.
Answer: 20
- 58 rounds to 60; 36 rounds to 40
- 60 − 40 = 20
The exact answer is 22, close to the estimate.
8.Estimate 69 + 77 by rounding each number to the nearest 10.
Answer: 150
- 69 rounds to 70; 77 rounds to 80
- 70 + 80 = 150
The exact answer is 146, close to the estimate.
9.Estimate 67 + 77 by rounding each number to the nearest 10.
Answer: 150
- 67 rounds to 70; 77 rounds to 80
- 70 + 80 = 150
The exact answer is 144, close to the estimate.
10.Estimate 33 + 33 by rounding each number to the nearest 10.
Answer: 60
- 33 rounds to 30; 33 rounds to 30
- 30 + 30 = 60
The exact answer is 66, 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.