Year 4 Estimating Sums, Differences and Products Worksheet — Level 2 — 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 2 — Practice Set 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 623 − 420 by rounding each number to the nearest 100.
Answer: 200
- 623 rounds to 600; 420 rounds to 400
- 600 − 400 = 200
The exact answer is 203, close to the estimate.
2.Estimate 72 × 8 by rounding 72 to the nearest 10.
Answer: 560
- 72 rounds to 70
- 70 × 8 = 560
The exact answer is 576.
3.Estimate 551 + 377 by rounding each number to the nearest 100.
Answer: 1,000
- 551 rounds to 600; 377 rounds to 400
- 600 + 400 = 1,000
The exact answer is 928, close to the estimate.
4.Estimate 85 × 7 by rounding 85 to the nearest 10.
Answer: 630
- 85 rounds to 90
- 90 × 7 = 630
The exact answer is 595.
5.Estimate 472 − 368 by rounding each number to the nearest 100.
Answer: 100
- 472 rounds to 500; 368 rounds to 400
- 500 − 400 = 100
The exact answer is 104, close to the estimate.
6.Estimate 11 × 4 by rounding 11 to the nearest 10.
Answer: 40
- 11 rounds to 10
- 10 × 4 = 40
The exact answer is 44.
7.Estimate 895 + 743 by rounding each number to the nearest 100.
Answer: 1,600
- 895 rounds to 900; 743 rounds to 700
- 900 + 700 = 1,600
The exact answer is 1,638, close to the estimate.
8.Estimate 97 × 4 by rounding 97 to the nearest 10.
Answer: 400
- 97 rounds to 100
- 100 × 4 = 400
The exact answer is 388.
9.Estimate 871 − 450 by rounding each number to the nearest 100.
Answer: 400
- 871 rounds to 900; 450 rounds to 500
- 900 − 500 = 400
The exact answer is 421, close to the estimate.
10.Estimate 76 × 6 by rounding 76 to the nearest 10.
Answer: 480
- 76 rounds to 80
- 80 × 6 = 480
The exact answer is 456.
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.