Year 5 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 2 — 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 — Practice Set 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 8,225 − 6,859 by rounding each number to the nearest 100.
Answer: 1,300
- 8,225 rounds to 8,200; 6,859 rounds to 6,900
- 8,200 − 6,900 = 1,300
The exact answer is 1,366, close to the estimate.
2.Estimate 97 × 43 by rounding each number to the nearest 10.
Answer: 4,000
- 97 rounds to 100; 43 rounds to 40
- 100 × 40 = 4,000
The exact answer is 4,171.
3.Estimate 19 × 6 by rounding 19 to the nearest 10.
Answer: 120
- 19 rounds to 20
- 20 × 6 = 120
The exact answer is 114.
4.Estimate 3,426 + 1,071 by rounding each number to the nearest 1,000.
Answer: 4,000
- 3,426 rounds to 3,000; 1,071 rounds to 1,000
- 3,000 + 1,000 = 4,000
The exact answer is 4,497, close to the estimate.
5.Estimate 85 × 73 by rounding each number to the nearest 10.
Answer: 6,300
- 85 rounds to 90; 73 rounds to 70
- 90 × 70 = 6,300
The exact answer is 6,205.
6.Estimate 89 × 3 by rounding 89 to the nearest 10.
Answer: 270
- 89 rounds to 90
- 90 × 3 = 270
The exact answer is 267.
7.Estimate 6,384 − 4,259 by rounding each number to the nearest 1,000.
Answer: 2,000
- 6,384 rounds to 6,000; 4,259 rounds to 4,000
- 6,000 − 4,000 = 2,000
The exact answer is 2,125, close to the estimate.
8.Estimate 25 × 22 by rounding each number to the nearest 10.
Answer: 600
- 25 rounds to 30; 22 rounds to 20
- 30 × 20 = 600
The exact answer is 550.
9.Estimate 64 × 8 by rounding 64 to the nearest 10.
Answer: 480
- 64 rounds to 60
- 60 × 8 = 480
The exact answer is 512.
10.Estimate 8,896 + 3,719 by rounding each number to the nearest 1,000.
Answer: 13,000
- 8,896 rounds to 9,000; 3,719 rounds to 4,000
- 9,000 + 4,000 = 13,000
The exact answer is 12,615, close to the estimate.
Marking tips
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