Year 4 Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 4 — 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 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 92 − 47 by rounding each number to the nearest 10.
Answer: 40
- 92 rounds to 90; 47 rounds to 50
- 90 − 50 = 40
The exact answer is 45, close to the estimate.
2.Estimate 82 − 13 by rounding each number to the nearest 10.
Answer: 70
- 82 rounds to 80; 13 rounds to 10
- 80 − 10 = 70
The exact answer is 69, close to the estimate.
3.Estimate 31 + 31 by rounding each number to the nearest 10.
Answer: 60
- 31 rounds to 30; 31 rounds to 30
- 30 + 30 = 60
The exact answer is 62, close to the estimate.
4.Estimate 73 + 57 by rounding each number to the nearest 10.
Answer: 130
- 73 rounds to 70; 57 rounds to 60
- 70 + 60 = 130
The exact answer is 130, close to the estimate.
5.Estimate 47 + 74 by rounding each number to the nearest 10.
Answer: 120
- 47 rounds to 50; 74 rounds to 70
- 50 + 70 = 120
The exact answer is 121, close to the estimate.
6.Estimate 79 − 25 by rounding each number to the nearest 10.
Answer: 50
- 79 rounds to 80; 25 rounds to 30
- 80 − 30 = 50
The exact answer is 54, close to the estimate.
7.Estimate 95 − 73 by rounding each number to the nearest 10.
Answer: 30
- 95 rounds to 100; 73 rounds to 70
- 100 − 70 = 30
The exact answer is 22, close to the estimate.
8.Estimate 31 + 34 by rounding each number to the nearest 10.
Answer: 60
- 31 rounds to 30; 34 rounds to 30
- 30 + 30 = 60
The exact answer is 65, close to the estimate.
9.Estimate 99 + 93 by rounding each number to the nearest 10.
Answer: 190
- 99 rounds to 100; 93 rounds to 90
- 100 + 90 = 190
The exact answer is 192, close to the estimate.
10.Estimate 22 + 22 by rounding each number to the nearest 10.
Answer: 40
- 22 rounds to 20; 22 rounds to 20
- 20 + 20 = 40
The exact answer is 44, 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.