Year 4 Estimating Sums, Differences and Products Worksheet — Level 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 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 5,150 + 5,391 by rounding each number to the nearest 100.
Answer: 10,600
- 5,150 rounds to 5,200; 5,391 rounds to 5,400
- 5,200 + 5,400 = 10,600
The exact answer is 10,541, close to the estimate.
2.Estimate 25 × 75 by rounding each number to the nearest 10.
Answer: 2,400
- 25 rounds to 30; 75 rounds to 80
- 30 × 80 = 2,400
The exact answer is 1,875.
3.Estimate 12 × 4 by rounding 12 to the nearest 10.
Answer: 40
- 12 rounds to 10
- 10 × 4 = 40
The exact answer is 48.
4.Estimate 4,261 + 4,668 by rounding each number to the nearest 1,000.
Answer: 9,000
- 4,261 rounds to 4,000; 4,668 rounds to 5,000
- 4,000 + 5,000 = 9,000
The exact answer is 8,929, close to the estimate.
5.Estimate 71 × 97 by rounding each number to the nearest 10.
Answer: 7,000
- 71 rounds to 70; 97 rounds to 100
- 70 × 100 = 7,000
The exact answer is 6,887.
6.Estimate 18 × 7 by rounding 18 to the nearest 10.
Answer: 140
- 18 rounds to 20
- 20 × 7 = 140
The exact answer is 126.
7.Estimate 7,624 + 1,812 by rounding each number to the nearest 1,000.
Answer: 10,000
- 7,624 rounds to 8,000; 1,812 rounds to 2,000
- 8,000 + 2,000 = 10,000
The exact answer is 9,436, close to the estimate.
8.Estimate 64 × 87 by rounding each number to the nearest 10.
Answer: 5,400
- 64 rounds to 60; 87 rounds to 90
- 60 × 90 = 5,400
The exact answer is 5,568.
9.Estimate 52 × 28 by rounding each number to the nearest 10.
Answer: 1,500
- 52 rounds to 50; 28 rounds to 30
- 50 × 30 = 1,500
The exact answer is 1,456.
10.Estimate 4,830 − 2,806 by rounding each number to the nearest 100.
Answer: 2,000
- 4,830 rounds to 4,800; 2,806 rounds to 2,800
- 4,800 − 2,800 = 2,000
The exact answer is 2,024, close to the estimate.
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