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 91 − 74 by rounding each number to the nearest 10.
Answer: 20
- 91 rounds to 90; 74 rounds to 70
- 90 − 70 = 20
The exact answer is 17, close to the estimate.
2.Estimate 93 + 99 by rounding each number to the nearest 10.
Answer: 190
- 93 rounds to 90; 99 rounds to 100
- 90 + 100 = 190
The exact answer is 192, close to the estimate.
3.Estimate 62 + 77 by rounding each number to the nearest 10.
Answer: 140
- 62 rounds to 60; 77 rounds to 80
- 60 + 80 = 140
The exact answer is 139, close to the estimate.
4.Estimate 36 − 33 by rounding each number to the nearest 10.
Answer: 10
- 36 rounds to 40; 33 rounds to 30
- 40 − 30 = 10
The exact answer is 3, close to the estimate.
5.Estimate 57 − 17 by rounding each number to the nearest 10.
Answer: 40
- 57 rounds to 60; 17 rounds to 20
- 60 − 20 = 40
The exact answer is 40, close to the estimate.
6.Estimate 23 − 12 by rounding each number to the nearest 10.
Answer: 10
- 23 rounds to 20; 12 rounds to 10
- 20 − 10 = 10
The exact answer is 11, close to the estimate.
7.Estimate 73 + 51 by rounding each number to the nearest 10.
Answer: 120
- 73 rounds to 70; 51 rounds to 50
- 70 + 50 = 120
The exact answer is 124, close to the estimate.
8.Estimate 35 + 59 by rounding each number to the nearest 10.
Answer: 100
- 35 rounds to 40; 59 rounds to 60
- 40 + 60 = 100
The exact answer is 94, close to the estimate.
9.Estimate 72 − 63 by rounding each number to the nearest 10.
Answer: 10
- 72 rounds to 70; 63 rounds to 60
- 70 − 60 = 10
The exact answer is 9, close to the estimate.
10.Estimate 58 − 53 by rounding each number to the nearest 10.
Answer: 10
- 58 rounds to 60; 53 rounds to 50
- 60 − 50 = 10
The exact answer is 5, 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.