Year 6 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 2 — 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 3 — Practice Set 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 7,009 − 4,915 by rounding each number to the nearest 1,000.
Answer: 2,000
- 7,009 rounds to 7,000; 4,915 rounds to 5,000
- 7,000 − 5,000 = 2,000
The exact answer is 2,094, close to the estimate.
2.Estimate 47 × 81 by rounding each number to the nearest 10.
Answer: 4,000
- 47 rounds to 50; 81 rounds to 80
- 50 × 80 = 4,000
The exact answer is 3,807.
3.Estimate 71 × 18 by rounding each number to the nearest 10.
Answer: 1,400
- 71 rounds to 70; 18 rounds to 20
- 70 × 20 = 1,400
The exact answer is 1,278.
4.Estimate 5,327 + 9,824 by rounding each number to the nearest 100.
Answer: 15,100
- 5,327 rounds to 5,300; 9,824 rounds to 9,800
- 5,300 + 9,800 = 15,100
The exact answer is 15,151, close to the estimate.
5.Estimate 76 × 71 by rounding each number to the nearest 10.
Answer: 5,600
- 76 rounds to 80; 71 rounds to 70
- 80 × 70 = 5,600
The exact answer is 5,396.
6.Estimate 15 × 15 by rounding each number to the nearest 10.
Answer: 400
- 15 rounds to 20; 15 rounds to 20
- 20 × 20 = 400
The exact answer is 225.
7.Estimate 5,550 − 5,333 by rounding each number to the nearest 100.
Answer: 300
- 5,550 rounds to 5,600; 5,333 rounds to 5,300
- 5,600 − 5,300 = 300
The exact answer is 217, close to the estimate.
8.Estimate 96 × 81 by rounding each number to the nearest 10.
Answer: 8,000
- 96 rounds to 100; 81 rounds to 80
- 100 × 80 = 8,000
The exact answer is 7,776.
9.Estimate 95 × 8 by rounding 95 to the nearest 10.
Answer: 800
- 95 rounds to 100
- 100 × 8 = 800
The exact answer is 760.
10.Estimate 9,548 − 3,719 by rounding each number to the nearest 100.
Answer: 5,800
- 9,548 rounds to 9,500; 3,719 rounds to 3,700
- 9,500 − 3,700 = 5,800
The exact answer is 5,829, 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.
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