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 165 + 459 by rounding each number to the nearest 100.
Answer: 700
- 165 rounds to 200; 459 rounds to 500
- 200 + 500 = 700
The exact answer is 624, close to the estimate.
2.Estimate 87 × 4 by rounding 87 to the nearest 10.
Answer: 360
- 87 rounds to 90
- 90 × 4 = 360
The exact answer is 348.
3.Estimate 225 + 511 by rounding each number to the nearest 100.
Answer: 700
- 225 rounds to 200; 511 rounds to 500
- 200 + 500 = 700
The exact answer is 736, close to the estimate.
4.Estimate 64 × 6 by rounding 64 to the nearest 10.
Answer: 360
- 64 rounds to 60
- 60 × 6 = 360
The exact answer is 384.
5.Estimate 892 − 643 by rounding each number to the nearest 100.
Answer: 300
- 892 rounds to 900; 643 rounds to 600
- 900 − 600 = 300
The exact answer is 249, close to the estimate.
6.Estimate 46 × 3 by rounding 46 to the nearest 10.
Answer: 150
- 46 rounds to 50
- 50 × 3 = 150
The exact answer is 138.
7.Estimate 542 + 643 by rounding each number to the nearest 100.
Answer: 1,100
- 542 rounds to 500; 643 rounds to 600
- 500 + 600 = 1,100
The exact answer is 1,185, close to the estimate.
8.Estimate 35 × 7 by rounding 35 to the nearest 10.
Answer: 280
- 35 rounds to 40
- 40 × 7 = 280
The exact answer is 245.
9.Estimate 707 − 529 by rounding each number to the nearest 100.
Answer: 200
- 707 rounds to 700; 529 rounds to 500
- 700 − 500 = 200
The exact answer is 178, close to the estimate.
10.Estimate 27 × 9 by rounding 27 to the nearest 10.
Answer: 270
- 27 rounds to 30
- 30 × 9 = 270
The exact answer is 243.
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.