Year 4 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 4 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 4 · Mathematics · Place ValueYear 4 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 8,316 + 3,773 by rounding each number to the nearest 100.
Answer: 12,100
- 8,316 rounds to 8,300; 3,773 rounds to 3,800
- 8,300 + 3,800 = 12,100
The exact answer is 12,089, close to the estimate.
2.Estimate 29 × 32 by rounding each number to the nearest 10.
Answer: 900
- 29 rounds to 30; 32 rounds to 30
- 30 × 30 = 900
The exact answer is 928.
3.Estimate 61 × 9 by rounding 61 to the nearest 10.
Answer: 540
- 61 rounds to 60
- 60 × 9 = 540
The exact answer is 549.
4.Estimate 8,741 − 8,189 by rounding each number to the nearest 1,000.
Answer: 1,000
- 8,741 rounds to 9,000; 8,189 rounds to 8,000
- 9,000 − 8,000 = 1,000
The exact answer is 552, close to the estimate.
5.Estimate 81 × 16 by rounding each number to the nearest 10.
Answer: 1,600
- 81 rounds to 80; 16 rounds to 20
- 80 × 20 = 1,600
The exact answer is 1,296.
6.Estimate 15 × 6 by rounding 15 to the nearest 10.
Answer: 120
- 15 rounds to 20
- 20 × 6 = 120
The exact answer is 90.
7.Estimate 2,913 + 7,438 by rounding each number to the nearest 100.
Answer: 10,300
- 2,913 rounds to 2,900; 7,438 rounds to 7,400
- 2,900 + 7,400 = 10,300
The exact answer is 10,351, close to the estimate.
8.Estimate 44 × 82 by rounding each number to the nearest 10.
Answer: 3,200
- 44 rounds to 40; 82 rounds to 80
- 40 × 80 = 3,200
The exact answer is 3,608.
9.Estimate 28 × 39 by rounding each number to the nearest 10.
Answer: 1,200
- 28 rounds to 30; 39 rounds to 40
- 30 × 40 = 1,200
The exact answer is 1,092.
10.Estimate 1,431 + 9,314 by rounding each number to the nearest 1,000.
Answer: 10,000
- 1,431 rounds to 1,000; 9,314 rounds to 9,000
- 1,000 + 9,000 = 10,000
The exact answer is 10,745, close to the estimate.
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