Year 7 Estimating Sums, Differences and Products Worksheet — Level 2 — Answers
Answer sheet with worked solutions for the Year 7 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 7 · Mathematics · Place ValueYear 7 Estimating Sums, Differences and Products Worksheet — Level 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 606 + 494 by rounding each number to the nearest 100.
Answer: 1,100
- 606 rounds to 600; 494 rounds to 500
- 600 + 500 = 1,100
The exact answer is 1,100, close to the estimate.
2.Estimate 33 × 7 by rounding 33 to the nearest 10.
Answer: 210
- 33 rounds to 30
- 30 × 7 = 210
The exact answer is 231.
3.Estimate 584 − 404 by rounding each number to the nearest 100.
Answer: 200
- 584 rounds to 600; 404 rounds to 400
- 600 − 400 = 200
The exact answer is 180, close to the estimate.
4.Estimate 35 × 7 by rounding 35 to the nearest 10.
Answer: 280
- 35 rounds to 40
- 40 × 7 = 280
The exact answer is 245.
5.Estimate 746 + 498 by rounding each number to the nearest 100.
Answer: 1,200
- 746 rounds to 700; 498 rounds to 500
- 700 + 500 = 1,200
The exact answer is 1,244, close to the estimate.
6.Estimate 41 × 4 by rounding 41 to the nearest 10.
Answer: 160
- 41 rounds to 40
- 40 × 4 = 160
The exact answer is 164.
7.Estimate 508 − 211 by rounding each number to the nearest 100.
Answer: 300
- 508 rounds to 500; 211 rounds to 200
- 500 − 200 = 300
The exact answer is 297, close to the estimate.
8.Estimate 26 × 3 by rounding 26 to the nearest 10.
Answer: 90
- 26 rounds to 30
- 30 × 3 = 90
The exact answer is 78.
9.Estimate 826 − 498 by rounding each number to the nearest 100.
Answer: 300
- 826 rounds to 800; 498 rounds to 500
- 800 − 500 = 300
The exact answer is 328, close to the estimate.
10.Estimate 26 × 5 by rounding 26 to the nearest 10.
Answer: 150
- 26 rounds to 30
- 30 × 5 = 150
The exact answer is 130.
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.