Year 3 Estimating Sums, Differences and Products Worksheet — Level 3 — 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 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 6,593 − 4,689 by rounding each number to the nearest 1,000.
Answer: 2,000
- 6,593 rounds to 7,000; 4,689 rounds to 5,000
- 7,000 − 5,000 = 2,000
The exact answer is 1,904, close to the estimate.
2.Estimate 79 × 54 by rounding each number to the nearest 10.
Answer: 4,000
- 79 rounds to 80; 54 rounds to 50
- 80 × 50 = 4,000
The exact answer is 4,266.
3.Estimate 82 × 17 by rounding each number to the nearest 10.
Answer: 1,600
- 82 rounds to 80; 17 rounds to 20
- 80 × 20 = 1,600
The exact answer is 1,394.
4.Estimate 1,583 + 8,703 by rounding each number to the nearest 100.
Answer: 10,300
- 1,583 rounds to 1,600; 8,703 rounds to 8,700
- 1,600 + 8,700 = 10,300
The exact answer is 10,286, close to the estimate.
5.Estimate 93 × 41 by rounding each number to the nearest 10.
Answer: 3,600
- 93 rounds to 90; 41 rounds to 40
- 90 × 40 = 3,600
The exact answer is 3,813.
6.Estimate 87 × 43 by rounding each number to the nearest 10.
Answer: 3,600
- 87 rounds to 90; 43 rounds to 40
- 90 × 40 = 3,600
The exact answer is 3,741.
7.Estimate 8,051 − 5,647 by rounding each number to the nearest 1,000.
Answer: 2,000
- 8,051 rounds to 8,000; 5,647 rounds to 6,000
- 8,000 − 6,000 = 2,000
The exact answer is 2,404, close to the estimate.
8.Estimate 46 × 88 by rounding each number to the nearest 10.
Answer: 4,500
- 46 rounds to 50; 88 rounds to 90
- 50 × 90 = 4,500
The exact answer is 4,048.
9.Estimate 33 × 31 by rounding each number to the nearest 10.
Answer: 900
- 33 rounds to 30; 31 rounds to 30
- 30 × 30 = 900
The exact answer is 1,023.
10.Estimate 4,326 + 8,086 by rounding each number to the nearest 100.
Answer: 12,400
- 4,326 rounds to 4,300; 8,086 rounds to 8,100
- 4,300 + 8,100 = 12,400
The exact answer is 12,412, 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.