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 38 + 32 by rounding each number to the nearest 10.
Answer: 70
- 38 rounds to 40; 32 rounds to 30
- 40 + 30 = 70
The exact answer is 70, close to the estimate.
2.Estimate 62 − 32 by rounding each number to the nearest 10.
Answer: 30
- 62 rounds to 60; 32 rounds to 30
- 60 − 30 = 30
The exact answer is 30, close to the estimate.
3.Estimate 92 + 17 by rounding each number to the nearest 10.
Answer: 110
- 92 rounds to 90; 17 rounds to 20
- 90 + 20 = 110
The exact answer is 109, close to the estimate.
4.Estimate 93 − 68 by rounding each number to the nearest 10.
Answer: 20
- 93 rounds to 90; 68 rounds to 70
- 90 − 70 = 20
The exact answer is 25, close to the estimate.
5.Estimate 87 − 33 by rounding each number to the nearest 10.
Answer: 60
- 87 rounds to 90; 33 rounds to 30
- 90 − 30 = 60
The exact answer is 54, close to the estimate.
6.Estimate 94 − 74 by rounding each number to the nearest 10.
Answer: 20
- 94 rounds to 90; 74 rounds to 70
- 90 − 70 = 20
The exact answer is 20, close to the estimate.
7.Estimate 13 + 99 by rounding each number to the nearest 10.
Answer: 110
- 13 rounds to 10; 99 rounds to 100
- 10 + 100 = 110
The exact answer is 112, close to the estimate.
8.Estimate 86 − 65 by rounding each number to the nearest 10.
Answer: 20
- 86 rounds to 90; 65 rounds to 70
- 90 − 70 = 20
The exact answer is 21, close to the estimate.
9.Estimate 82 + 91 by rounding each number to the nearest 10.
Answer: 170
- 82 rounds to 80; 91 rounds to 90
- 80 + 90 = 170
The exact answer is 173, close to the estimate.
10.Estimate 65 + 88 by rounding each number to the nearest 10.
Answer: 160
- 65 rounds to 70; 88 rounds to 90
- 70 + 90 = 160
The exact answer is 153, 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.