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 97 − 92 by rounding each number to the nearest 10.
Answer: 10
- 97 rounds to 100; 92 rounds to 90
- 100 − 90 = 10
The exact answer is 5, close to the estimate.
2.Estimate 47 + 59 by rounding each number to the nearest 10.
Answer: 110
- 47 rounds to 50; 59 rounds to 60
- 50 + 60 = 110
The exact answer is 106, close to the estimate.
3.Estimate 79 − 23 by rounding each number to the nearest 10.
Answer: 60
- 79 rounds to 80; 23 rounds to 20
- 80 − 20 = 60
The exact answer is 56, close to the estimate.
4.Estimate 73 + 71 by rounding each number to the nearest 10.
Answer: 140
- 73 rounds to 70; 71 rounds to 70
- 70 + 70 = 140
The exact answer is 144, close to the estimate.
5.Estimate 62 − 15 by rounding each number to the nearest 10.
Answer: 40
- 62 rounds to 60; 15 rounds to 20
- 60 − 20 = 40
The exact answer is 47, close to the estimate.
6.Estimate 93 + 27 by rounding each number to the nearest 10.
Answer: 120
- 93 rounds to 90; 27 rounds to 30
- 90 + 30 = 120
The exact answer is 120, close to the estimate.
7.Estimate 67 + 42 by rounding each number to the nearest 10.
Answer: 110
- 67 rounds to 70; 42 rounds to 40
- 70 + 40 = 110
The exact answer is 109, close to the estimate.
8.Estimate 14 + 16 by rounding each number to the nearest 10.
Answer: 30
- 14 rounds to 10; 16 rounds to 20
- 10 + 20 = 30
The exact answer is 30, close to the estimate.
9.Estimate 29 + 57 by rounding each number to the nearest 10.
Answer: 90
- 29 rounds to 30; 57 rounds to 60
- 30 + 60 = 90
The exact answer is 86, close to the estimate.
10.Estimate 24 + 48 by rounding each number to the nearest 10.
Answer: 70
- 24 rounds to 20; 48 rounds to 50
- 20 + 50 = 70
The exact answer is 72, 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.