Year 3 Estimating Sums, Differences and Products Worksheet — Level 2 — 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 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 131 + 152 by rounding each number to the nearest 100.
Answer: 300
- 131 rounds to 100; 152 rounds to 200
- 100 + 200 = 300
The exact answer is 283, close to the estimate.
2.Estimate 28 × 8 by rounding 28 to the nearest 10.
Answer: 240
- 28 rounds to 30
- 30 × 8 = 240
The exact answer is 224.
3.Estimate 255 + 947 by rounding each number to the nearest 100.
Answer: 1,200
- 255 rounds to 300; 947 rounds to 900
- 300 + 900 = 1,200
The exact answer is 1,202, close to the estimate.
4.Estimate 71 × 6 by rounding 71 to the nearest 10.
Answer: 420
- 71 rounds to 70
- 70 × 6 = 420
The exact answer is 426.
5.Estimate 887 − 843 by rounding each number to the nearest 100.
Answer: 100
- 887 rounds to 900; 843 rounds to 800
- 900 − 800 = 100
The exact answer is 44, close to the estimate.
6.Estimate 46 × 4 by rounding 46 to the nearest 10.
Answer: 200
- 46 rounds to 50
- 50 × 4 = 200
The exact answer is 184.
7.Estimate 747 − 162 by rounding each number to the nearest 100.
Answer: 500
- 747 rounds to 700; 162 rounds to 200
- 700 − 200 = 500
The exact answer is 585, close to the estimate.
8.Estimate 24 × 6 by rounding 24 to the nearest 10.
Answer: 120
- 24 rounds to 20
- 20 × 6 = 120
The exact answer is 144.
9.Estimate 897 − 479 by rounding each number to the nearest 100.
Answer: 400
- 897 rounds to 900; 479 rounds to 500
- 900 − 500 = 400
The exact answer is 418, close to the estimate.
10.Estimate 12 × 4 by rounding 12 to the nearest 10.
Answer: 40
- 12 rounds to 10
- 10 × 4 = 40
The exact answer is 48.
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.