Year 4 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 4 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 4 · Mathematics · Place ValueYear 4 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 2,471 + 1,011 by rounding each number to the nearest 100.
Answer: 3,500
- 2,471 rounds to 2,500; 1,011 rounds to 1,000
- 2,500 + 1,000 = 3,500
The exact answer is 3,482, close to the estimate.
2.Estimate 62 × 17 by rounding each number to the nearest 10.
Answer: 1,200
- 62 rounds to 60; 17 rounds to 20
- 60 × 20 = 1,200
The exact answer is 1,054.
3.Estimate 16 × 52 by rounding each number to the nearest 10.
Answer: 1,000
- 16 rounds to 20; 52 rounds to 50
- 20 × 50 = 1,000
The exact answer is 832.
4.Estimate 8,240 − 2,276 by rounding each number to the nearest 100.
Answer: 5,900
- 8,240 rounds to 8,200; 2,276 rounds to 2,300
- 8,200 − 2,300 = 5,900
The exact answer is 5,964, close to the estimate.
5.Estimate 33 × 93 by rounding each number to the nearest 10.
Answer: 2,700
- 33 rounds to 30; 93 rounds to 90
- 30 × 90 = 2,700
The exact answer is 3,069.
6.Estimate 97 × 14 by rounding each number to the nearest 10.
Answer: 1,000
- 97 rounds to 100; 14 rounds to 10
- 100 × 10 = 1,000
The exact answer is 1,358.
7.Estimate 7,024 − 4,022 by rounding each number to the nearest 100.
Answer: 3,000
- 7,024 rounds to 7,000; 4,022 rounds to 4,000
- 7,000 − 4,000 = 3,000
The exact answer is 3,002, close to the estimate.
8.Estimate 76 × 97 by rounding each number to the nearest 10.
Answer: 8,000
- 76 rounds to 80; 97 rounds to 100
- 80 × 100 = 8,000
The exact answer is 7,372.
9.Estimate 41 × 62 by rounding each number to the nearest 10.
Answer: 2,400
- 41 rounds to 40; 62 rounds to 60
- 40 × 60 = 2,400
The exact answer is 2,542.
10.Estimate 2,264 + 6,047 by rounding each number to the nearest 100.
Answer: 8,300
- 2,264 rounds to 2,300; 6,047 rounds to 6,000
- 2,300 + 6,000 = 8,300
The exact answer is 8,311, 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.