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 12 + 83 by rounding each number to the nearest 10.
Answer: 90
- 12 rounds to 10; 83 rounds to 80
- 10 + 80 = 90
The exact answer is 95, close to the estimate.
2.Estimate 63 + 91 by rounding each number to the nearest 10.
Answer: 150
- 63 rounds to 60; 91 rounds to 90
- 60 + 90 = 150
The exact answer is 154, close to the estimate.
3.Estimate 33 + 57 by rounding each number to the nearest 10.
Answer: 90
- 33 rounds to 30; 57 rounds to 60
- 30 + 60 = 90
The exact answer is 90, close to the estimate.
4.Estimate 74 + 13 by rounding each number to the nearest 10.
Answer: 80
- 74 rounds to 70; 13 rounds to 10
- 70 + 10 = 80
The exact answer is 87, close to the estimate.
5.Estimate 22 + 94 by rounding each number to the nearest 10.
Answer: 110
- 22 rounds to 20; 94 rounds to 90
- 20 + 90 = 110
The exact answer is 116, close to the estimate.
6.Estimate 74 − 42 by rounding each number to the nearest 10.
Answer: 30
- 74 rounds to 70; 42 rounds to 40
- 70 − 40 = 30
The exact answer is 32, close to the estimate.
7.Estimate 96 − 48 by rounding each number to the nearest 10.
Answer: 50
- 96 rounds to 100; 48 rounds to 50
- 100 − 50 = 50
The exact answer is 48, close to the estimate.
8.Estimate 38 + 49 by rounding each number to the nearest 10.
Answer: 90
- 38 rounds to 40; 49 rounds to 50
- 40 + 50 = 90
The exact answer is 87, close to the estimate.
9.Estimate 65 − 23 by rounding each number to the nearest 10.
Answer: 50
- 65 rounds to 70; 23 rounds to 20
- 70 − 20 = 50
The exact answer is 42, close to the estimate.
10.Estimate 88 + 26 by rounding each number to the nearest 10.
Answer: 120
- 88 rounds to 90; 26 rounds to 30
- 90 + 30 = 120
The exact answer is 114, 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.