Year 6 Estimating Sums, Differences and Products Worksheet — Level 3 — 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 3 — Practice Set 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 6,931 − 2,317 by rounding each number to the nearest 1,000.
Answer: 5,000
- 6,931 rounds to 7,000; 2,317 rounds to 2,000
- 7,000 − 2,000 = 5,000
The exact answer is 4,614, close to the estimate.
2.Estimate 57 × 19 by rounding each number to the nearest 10.
Answer: 1,200
- 57 rounds to 60; 19 rounds to 20
- 60 × 20 = 1,200
The exact answer is 1,083.
3.Estimate 56 × 91 by rounding each number to the nearest 10.
Answer: 5,400
- 56 rounds to 60; 91 rounds to 90
- 60 × 90 = 5,400
The exact answer is 5,096.
4.Estimate 6,215 − 5,457 by rounding each number to the nearest 1,000.
Answer: 1,000
- 6,215 rounds to 6,000; 5,457 rounds to 5,000
- 6,000 − 5,000 = 1,000
The exact answer is 758, close to the estimate.
5.Estimate 74 × 73 by rounding each number to the nearest 10.
Answer: 4,900
- 74 rounds to 70; 73 rounds to 70
- 70 × 70 = 4,900
The exact answer is 5,402.
6.Estimate 29 × 31 by rounding each number to the nearest 10.
Answer: 900
- 29 rounds to 30; 31 rounds to 30
- 30 × 30 = 900
The exact answer is 899.
7.Estimate 5,111 + 9,627 by rounding each number to the nearest 100.
Answer: 14,700
- 5,111 rounds to 5,100; 9,627 rounds to 9,600
- 5,100 + 9,600 = 14,700
The exact answer is 14,738, close to the estimate.
8.Estimate 17 × 16 by rounding each number to the nearest 10.
Answer: 400
- 17 rounds to 20; 16 rounds to 20
- 20 × 20 = 400
The exact answer is 272.
9.Estimate 64 × 77 by rounding each number to the nearest 10.
Answer: 4,800
- 64 rounds to 60; 77 rounds to 80
- 60 × 80 = 4,800
The exact answer is 4,928.
10.Estimate 9,072 − 3,001 by rounding each number to the nearest 100.
Answer: 6,100
- 9,072 rounds to 9,100; 3,001 rounds to 3,000
- 9,100 − 3,000 = 6,100
The exact answer is 6,071, 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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