Year 3 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 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 3 — Practice Set 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 5,490 + 8,826 by rounding each number to the nearest 1,000.
Answer: 14,000
- 5,490 rounds to 5,000; 8,826 rounds to 9,000
- 5,000 + 9,000 = 14,000
The exact answer is 14,316, close to the estimate.
2.Estimate 52 × 45 by rounding each number to the nearest 10.
Answer: 2,500
- 52 rounds to 50; 45 rounds to 50
- 50 × 50 = 2,500
The exact answer is 2,340.
3.Estimate 64 × 82 by rounding each number to the nearest 10.
Answer: 4,800
- 64 rounds to 60; 82 rounds to 80
- 60 × 80 = 4,800
The exact answer is 5,248.
4.Estimate 9,251 − 6,927 by rounding each number to the nearest 100.
Answer: 2,400
- 9,251 rounds to 9,300; 6,927 rounds to 6,900
- 9,300 − 6,900 = 2,400
The exact answer is 2,324, close to the estimate.
5.Estimate 46 × 42 by rounding each number to the nearest 10.
Answer: 2,000
- 46 rounds to 50; 42 rounds to 40
- 50 × 40 = 2,000
The exact answer is 1,932.
6.Estimate 42 × 3 by rounding 42 to the nearest 10.
Answer: 120
- 42 rounds to 40
- 40 × 3 = 120
The exact answer is 126.
7.Estimate 4,311 − 2,704 by rounding each number to the nearest 100.
Answer: 1,600
- 4,311 rounds to 4,300; 2,704 rounds to 2,700
- 4,300 − 2,700 = 1,600
The exact answer is 1,607, close to the estimate.
8.Estimate 87 × 81 by rounding each number to the nearest 10.
Answer: 7,200
- 87 rounds to 90; 81 rounds to 80
- 90 × 80 = 7,200
The exact answer is 7,047.
9.Estimate 88 × 35 by rounding each number to the nearest 10.
Answer: 3,600
- 88 rounds to 90; 35 rounds to 40
- 90 × 40 = 3,600
The exact answer is 3,080.
10.Estimate 3,169 + 6,125 by rounding each number to the nearest 1,000.
Answer: 9,000
- 3,169 rounds to 3,000; 6,125 rounds to 6,000
- 3,000 + 6,000 = 9,000
The exact answer is 9,294, 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.