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 72 − 22 by rounding each number to the nearest 10.
Answer: 50
- 72 rounds to 70; 22 rounds to 20
- 70 − 20 = 50
The exact answer is 50, close to the estimate.
2.Estimate 57 + 23 by rounding each number to the nearest 10.
Answer: 80
- 57 rounds to 60; 23 rounds to 20
- 60 + 20 = 80
The exact answer is 80, close to the estimate.
3.Estimate 69 + 91 by rounding each number to the nearest 10.
Answer: 160
- 69 rounds to 70; 91 rounds to 90
- 70 + 90 = 160
The exact answer is 160, close to the estimate.
4.Estimate 35 + 85 by rounding each number to the nearest 10.
Answer: 130
- 35 rounds to 40; 85 rounds to 90
- 40 + 90 = 130
The exact answer is 120, close to the estimate.
5.Estimate 97 − 69 by rounding each number to the nearest 10.
Answer: 30
- 97 rounds to 100; 69 rounds to 70
- 100 − 70 = 30
The exact answer is 28, close to the estimate.
6.Estimate 14 + 59 by rounding each number to the nearest 10.
Answer: 70
- 14 rounds to 10; 59 rounds to 60
- 10 + 60 = 70
The exact answer is 73, close to the estimate.
7.Estimate 83 − 18 by rounding each number to the nearest 10.
Answer: 60
- 83 rounds to 80; 18 rounds to 20
- 80 − 20 = 60
The exact answer is 65, close to the estimate.
8.Estimate 61 + 77 by rounding each number to the nearest 10.
Answer: 140
- 61 rounds to 60; 77 rounds to 80
- 60 + 80 = 140
The exact answer is 138, close to the estimate.
9.Estimate 14 + 32 by rounding each number to the nearest 10.
Answer: 40
- 14 rounds to 10; 32 rounds to 30
- 10 + 30 = 40
The exact answer is 46, close to the estimate.
10.Estimate 49 + 37 by rounding each number to the nearest 10.
Answer: 90
- 49 rounds to 50; 37 rounds to 40
- 50 + 40 = 90
The exact answer is 86, 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.