Year 3 Estimating Sums, Differences and Products Worksheet — Level 3 — 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 3 — Practice Set 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 7,192 + 4,381 by rounding each number to the nearest 1,000.
Answer: 11,000
- 7,192 rounds to 7,000; 4,381 rounds to 4,000
- 7,000 + 4,000 = 11,000
The exact answer is 11,573, close to the estimate.
2.Estimate 84 × 63 by rounding each number to the nearest 10.
Answer: 4,800
- 84 rounds to 80; 63 rounds to 60
- 80 × 60 = 4,800
The exact answer is 5,292.
3.Estimate 29 × 84 by rounding each number to the nearest 10.
Answer: 2,400
- 29 rounds to 30; 84 rounds to 80
- 30 × 80 = 2,400
The exact answer is 2,436.
4.Estimate 5,636 + 7,262 by rounding each number to the nearest 1,000.
Answer: 13,000
- 5,636 rounds to 6,000; 7,262 rounds to 7,000
- 6,000 + 7,000 = 13,000
The exact answer is 12,898, close to the estimate.
5.Estimate 19 × 59 by rounding each number to the nearest 10.
Answer: 1,200
- 19 rounds to 20; 59 rounds to 60
- 20 × 60 = 1,200
The exact answer is 1,121.
6.Estimate 44 × 12 by rounding each number to the nearest 10.
Answer: 400
- 44 rounds to 40; 12 rounds to 10
- 40 × 10 = 400
The exact answer is 528.
7.Estimate 5,386 + 6,813 by rounding each number to the nearest 100.
Answer: 12,200
- 5,386 rounds to 5,400; 6,813 rounds to 6,800
- 5,400 + 6,800 = 12,200
The exact answer is 12,199, close to the estimate.
8.Estimate 73 × 35 by rounding each number to the nearest 10.
Answer: 2,800
- 73 rounds to 70; 35 rounds to 40
- 70 × 40 = 2,800
The exact answer is 2,555.
9.Estimate 55 × 3 by rounding 55 to the nearest 10.
Answer: 180
- 55 rounds to 60
- 60 × 3 = 180
The exact answer is 165.
10.Estimate 6,931 − 2,866 by rounding each number to the nearest 100.
Answer: 4,000
- 6,931 rounds to 6,900; 2,866 rounds to 2,900
- 6,900 − 2,900 = 4,000
The exact answer is 4,065, close to the estimate.
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.