Year 4 Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 3 — 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 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 93 + 88 by rounding each number to the nearest 10.
Answer: 180
- 93 rounds to 90; 88 rounds to 90
- 90 + 90 = 180
The exact answer is 181, close to the estimate.
2.Estimate 98 − 66 by rounding each number to the nearest 10.
Answer: 30
- 98 rounds to 100; 66 rounds to 70
- 100 − 70 = 30
The exact answer is 32, close to the estimate.
3.Estimate 68 − 24 by rounding each number to the nearest 10.
Answer: 50
- 68 rounds to 70; 24 rounds to 20
- 70 − 20 = 50
The exact answer is 44, close to the estimate.
4.Estimate 52 + 45 by rounding each number to the nearest 10.
Answer: 100
- 52 rounds to 50; 45 rounds to 50
- 50 + 50 = 100
The exact answer is 97, close to the estimate.
5.Estimate 11 + 15 by rounding each number to the nearest 10.
Answer: 30
- 11 rounds to 10; 15 rounds to 20
- 10 + 20 = 30
The exact answer is 26, close to the estimate.
6.Estimate 51 − 14 by rounding each number to the nearest 10.
Answer: 40
- 51 rounds to 50; 14 rounds to 10
- 50 − 10 = 40
The exact answer is 37, close to the estimate.
7.Estimate 96 − 82 by rounding each number to the nearest 10.
Answer: 20
- 96 rounds to 100; 82 rounds to 80
- 100 − 80 = 20
The exact answer is 14, close to the estimate.
8.Estimate 75 + 58 by rounding each number to the nearest 10.
Answer: 140
- 75 rounds to 80; 58 rounds to 60
- 80 + 60 = 140
The exact answer is 133, close to the estimate.
9.Estimate 71 − 51 by rounding each number to the nearest 10.
Answer: 20
- 71 rounds to 70; 51 rounds to 50
- 70 − 50 = 20
The exact answer is 20, close to the estimate.
10.Estimate 85 + 72 by rounding each number to the nearest 10.
Answer: 160
- 85 rounds to 90; 72 rounds to 70
- 90 + 70 = 160
The exact answer is 157, 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.