Year 4 Estimating Sums, Differences and Products Worksheet — Level 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 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 715 + 732 by rounding each number to the nearest 100.
Answer: 1,400
- 715 rounds to 700; 732 rounds to 700
- 700 + 700 = 1,400
The exact answer is 1,447, close to the estimate.
2.Estimate 91 × 4 by rounding 91 to the nearest 10.
Answer: 360
- 91 rounds to 90
- 90 × 4 = 360
The exact answer is 364.
3.Estimate 897 − 652 by rounding each number to the nearest 100.
Answer: 200
- 897 rounds to 900; 652 rounds to 700
- 900 − 700 = 200
The exact answer is 245, close to the estimate.
4.Estimate 64 × 9 by rounding 64 to the nearest 10.
Answer: 540
- 64 rounds to 60
- 60 × 9 = 540
The exact answer is 576.
5.Estimate 143 + 315 by rounding each number to the nearest 100.
Answer: 400
- 143 rounds to 100; 315 rounds to 300
- 100 + 300 = 400
The exact answer is 458, close to the estimate.
6.Estimate 66 × 7 by rounding 66 to the nearest 10.
Answer: 490
- 66 rounds to 70
- 70 × 7 = 490
The exact answer is 462.
7.Estimate 942 + 733 by rounding each number to the nearest 100.
Answer: 1,600
- 942 rounds to 900; 733 rounds to 700
- 900 + 700 = 1,600
The exact answer is 1,675, close to the estimate.
8.Estimate 25 × 5 by rounding 25 to the nearest 10.
Answer: 150
- 25 rounds to 30
- 30 × 5 = 150
The exact answer is 125.
9.Estimate 381 − 312 by rounding each number to the nearest 100.
Answer: 100
- 381 rounds to 400; 312 rounds to 300
- 400 − 300 = 100
The exact answer is 69, close to the estimate.
10.Estimate 72 × 7 by rounding 72 to the nearest 10.
Answer: 490
- 72 rounds to 70
- 70 × 7 = 490
The exact answer is 504.
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.