Year 4 Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 2 — Answers
Answer sheet with worked solutions for the Year 4 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 4 · Mathematics · Place ValueYear 4 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 71 − 24 by rounding each number to the nearest 10.
Answer: 50
- 71 rounds to 70; 24 rounds to 20
- 70 − 20 = 50
The exact answer is 47, close to the estimate.
2.Estimate 93 + 62 by rounding each number to the nearest 10.
Answer: 150
- 93 rounds to 90; 62 rounds to 60
- 90 + 60 = 150
The exact answer is 155, close to the estimate.
3.Estimate 95 − 87 by rounding each number to the nearest 10.
Answer: 10
- 95 rounds to 100; 87 rounds to 90
- 100 − 90 = 10
The exact answer is 8, close to the estimate.
4.Estimate 71 + 32 by rounding each number to the nearest 10.
Answer: 100
- 71 rounds to 70; 32 rounds to 30
- 70 + 30 = 100
The exact answer is 103, close to the estimate.
5.Estimate 32 − 16 by rounding each number to the nearest 10.
Answer: 10
- 32 rounds to 30; 16 rounds to 20
- 30 − 20 = 10
The exact answer is 16, close to the estimate.
6.Estimate 78 − 11 by rounding each number to the nearest 10.
Answer: 70
- 78 rounds to 80; 11 rounds to 10
- 80 − 10 = 70
The exact answer is 67, close to the estimate.
7.Estimate 59 − 22 by rounding each number to the nearest 10.
Answer: 40
- 59 rounds to 60; 22 rounds to 20
- 60 − 20 = 40
The exact answer is 37, close to the estimate.
8.Estimate 29 + 58 by rounding each number to the nearest 10.
Answer: 90
- 29 rounds to 30; 58 rounds to 60
- 30 + 60 = 90
The exact answer is 87, close to the estimate.
9.Estimate 94 + 12 by rounding each number to the nearest 10.
Answer: 100
- 94 rounds to 90; 12 rounds to 10
- 90 + 10 = 100
The exact answer is 106, close to the estimate.
10.Estimate 79 − 46 by rounding each number to the nearest 10.
Answer: 30
- 79 rounds to 80; 46 rounds to 50
- 80 − 50 = 30
The exact answer is 33, 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.