Year 3 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 3 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 3 · Mathematics · Place ValueYear 3 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 890 − 647 by rounding each number to the nearest 100.
Answer: 300
- 890 rounds to 900; 647 rounds to 600
- 900 − 600 = 300
The exact answer is 243, close to the estimate.
2.Estimate 56 × 6 by rounding 56 to the nearest 10.
Answer: 360
- 56 rounds to 60
- 60 × 6 = 360
The exact answer is 336.
3.Estimate 528 + 266 by rounding each number to the nearest 100.
Answer: 800
- 528 rounds to 500; 266 rounds to 300
- 500 + 300 = 800
The exact answer is 794, close to the estimate.
4.Estimate 73 × 8 by rounding 73 to the nearest 10.
Answer: 560
- 73 rounds to 70
- 70 × 8 = 560
The exact answer is 584.
5.Estimate 847 − 580 by rounding each number to the nearest 100.
Answer: 200
- 847 rounds to 800; 580 rounds to 600
- 800 − 600 = 200
The exact answer is 267, close to the estimate.
6.Estimate 65 × 5 by rounding 65 to the nearest 10.
Answer: 350
- 65 rounds to 70
- 70 × 5 = 350
The exact answer is 325.
7.Estimate 861 − 418 by rounding each number to the nearest 100.
Answer: 500
- 861 rounds to 900; 418 rounds to 400
- 900 − 400 = 500
The exact answer is 443, close to the estimate.
8.Estimate 46 × 9 by rounding 46 to the nearest 10.
Answer: 450
- 46 rounds to 50
- 50 × 9 = 450
The exact answer is 414.
9.Estimate 729 + 336 by rounding each number to the nearest 100.
Answer: 1,000
- 729 rounds to 700; 336 rounds to 300
- 700 + 300 = 1,000
The exact answer is 1,065, close to the estimate.
10.Estimate 31 × 8 by rounding 31 to the nearest 10.
Answer: 240
- 31 rounds to 30
- 30 × 8 = 240
The exact answer is 248.
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.