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 7,866 + 8,093 by rounding each number to the nearest 100.
Answer: 16,000
- 7,866 rounds to 7,900; 8,093 rounds to 8,100
- 7,900 + 8,100 = 16,000
The exact answer is 15,959, close to the estimate.
2.Estimate 37 × 21 by rounding each number to the nearest 10.
Answer: 800
- 37 rounds to 40; 21 rounds to 20
- 40 × 20 = 800
The exact answer is 777.
3.Estimate 17 × 5 by rounding 17 to the nearest 10.
Answer: 100
- 17 rounds to 20
- 20 × 5 = 100
The exact answer is 85.
4.Estimate 4,419 + 7,771 by rounding each number to the nearest 100.
Answer: 12,200
- 4,419 rounds to 4,400; 7,771 rounds to 7,800
- 4,400 + 7,800 = 12,200
The exact answer is 12,190, close to the estimate.
5.Estimate 68 × 36 by rounding each number to the nearest 10.
Answer: 2,800
- 68 rounds to 70; 36 rounds to 40
- 70 × 40 = 2,800
The exact answer is 2,448.
6.Estimate 13 × 8 by rounding 13 to the nearest 10.
Answer: 80
- 13 rounds to 10
- 10 × 8 = 80
The exact answer is 104.
7.Estimate 7,970 − 5,913 by rounding each number to the nearest 100.
Answer: 2,100
- 7,970 rounds to 8,000; 5,913 rounds to 5,900
- 8,000 − 5,900 = 2,100
The exact answer is 2,057, close to the estimate.
8.Estimate 59 × 52 by rounding each number to the nearest 10.
Answer: 3,000
- 59 rounds to 60; 52 rounds to 50
- 60 × 50 = 3,000
The exact answer is 3,068.
9.Estimate 64 × 37 by rounding each number to the nearest 10.
Answer: 2,400
- 64 rounds to 60; 37 rounds to 40
- 60 × 40 = 2,400
The exact answer is 2,368.
10.Estimate 4,169 − 2,713 by rounding each number to the nearest 100.
Answer: 1,500
- 4,169 rounds to 4,200; 2,713 rounds to 2,700
- 4,200 − 2,700 = 1,500
The exact answer is 1,456, close to the estimate.
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