Year 6 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 6 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 6 · Mathematics · Place ValueYear 6 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 334 + 815 by rounding each number to the nearest 100.
Answer: 1,100
- 334 rounds to 300; 815 rounds to 800
- 300 + 800 = 1,100
The exact answer is 1,149, close to the estimate.
2.Estimate 18 × 6 by rounding 18 to the nearest 10.
Answer: 120
- 18 rounds to 20
- 20 × 6 = 120
The exact answer is 108.
3.Estimate 440 − 258 by rounding each number to the nearest 100.
Answer: 100
- 440 rounds to 400; 258 rounds to 300
- 400 − 300 = 100
The exact answer is 182, close to the estimate.
4.Estimate 59 × 7 by rounding 59 to the nearest 10.
Answer: 420
- 59 rounds to 60
- 60 × 7 = 420
The exact answer is 413.
5.Estimate 557 − 433 by rounding each number to the nearest 100.
Answer: 200
- 557 rounds to 600; 433 rounds to 400
- 600 − 400 = 200
The exact answer is 124, close to the estimate.
6.Estimate 45 × 4 by rounding 45 to the nearest 10.
Answer: 200
- 45 rounds to 50
- 50 × 4 = 200
The exact answer is 180.
7.Estimate 576 − 130 by rounding each number to the nearest 100.
Answer: 500
- 576 rounds to 600; 130 rounds to 100
- 600 − 100 = 500
The exact answer is 446, close to the estimate.
8.Estimate 94 × 3 by rounding 94 to the nearest 10.
Answer: 270
- 94 rounds to 90
- 90 × 3 = 270
The exact answer is 282.
9.Estimate 921 + 942 by rounding each number to the nearest 100.
Answer: 1,800
- 921 rounds to 900; 942 rounds to 900
- 900 + 900 = 1,800
The exact answer is 1,863, close to the estimate.
10.Estimate 11 × 4 by rounding 11 to the nearest 10.
Answer: 40
- 11 rounds to 10
- 10 × 4 = 40
The exact answer is 44.
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.