Year 5 Estimating Sums, Differences and Products Worksheet — Level 3 — Answers
Answer sheet with worked solutions for the Year 5 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 5 · Mathematics · Place ValueYear 5 Estimating Sums, Differences and Products Worksheet — Level 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 9,450 − 7,586 by rounding each number to the nearest 1,000.
Answer: 1,000
- 9,450 rounds to 9,000; 7,586 rounds to 8,000
- 9,000 − 8,000 = 1,000
The exact answer is 1,864, close to the estimate.
2.Estimate 43 × 73 by rounding each number to the nearest 10.
Answer: 2,800
- 43 rounds to 40; 73 rounds to 70
- 40 × 70 = 2,800
The exact answer is 3,139.
3.Estimate 98 × 81 by rounding each number to the nearest 10.
Answer: 8,000
- 98 rounds to 100; 81 rounds to 80
- 100 × 80 = 8,000
The exact answer is 7,938.
4.Estimate 7,077 − 4,347 by rounding each number to the nearest 1,000.
Answer: 3,000
- 7,077 rounds to 7,000; 4,347 rounds to 4,000
- 7,000 − 4,000 = 3,000
The exact answer is 2,730, close to the estimate.
5.Estimate 95 × 96 by rounding each number to the nearest 10.
Answer: 10,000
- 95 rounds to 100; 96 rounds to 100
- 100 × 100 = 10,000
The exact answer is 9,120.
6.Estimate 12 × 43 by rounding each number to the nearest 10.
Answer: 400
- 12 rounds to 10; 43 rounds to 40
- 10 × 40 = 400
The exact answer is 516.
7.Estimate 9,902 − 1,917 by rounding each number to the nearest 1,000.
Answer: 8,000
- 9,902 rounds to 10,000; 1,917 rounds to 2,000
- 10,000 − 2,000 = 8,000
The exact answer is 7,985, close to the estimate.
8.Estimate 63 × 49 by rounding each number to the nearest 10.
Answer: 3,000
- 63 rounds to 60; 49 rounds to 50
- 60 × 50 = 3,000
The exact answer is 3,087.
9.Estimate 56 × 8 by rounding 56 to the nearest 10.
Answer: 480
- 56 rounds to 60
- 60 × 8 = 480
The exact answer is 448.
10.Estimate 3,008 + 4,879 by rounding each number to the nearest 1,000.
Answer: 8,000
- 3,008 rounds to 3,000; 4,879 rounds to 5,000
- 3,000 + 5,000 = 8,000
The exact answer is 7,887, close to the estimate.
Marking tips
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