Year 4 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 2 — 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 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 5,432 + 2,470 by rounding each number to the nearest 100.
Answer: 7,900
- 5,432 rounds to 5,400; 2,470 rounds to 2,500
- 5,400 + 2,500 = 7,900
The exact answer is 7,902, close to the estimate.
2.Estimate 64 × 11 by rounding each number to the nearest 10.
Answer: 600
- 64 rounds to 60; 11 rounds to 10
- 60 × 10 = 600
The exact answer is 704.
3.Estimate 67 × 65 by rounding each number to the nearest 10.
Answer: 4,900
- 67 rounds to 70; 65 rounds to 70
- 70 × 70 = 4,900
The exact answer is 4,355.
4.Estimate 7,546 − 3,300 by rounding each number to the nearest 1,000.
Answer: 5,000
- 7,546 rounds to 8,000; 3,300 rounds to 3,000
- 8,000 − 3,000 = 5,000
The exact answer is 4,246, close to the estimate.
5.Estimate 11 × 18 by rounding each number to the nearest 10.
Answer: 200
- 11 rounds to 10; 18 rounds to 20
- 10 × 20 = 200
The exact answer is 198.
6.Estimate 67 × 6 by rounding 67 to the nearest 10.
Answer: 420
- 67 rounds to 70
- 70 × 6 = 420
The exact answer is 402.
7.Estimate 9,772 − 7,868 by rounding each number to the nearest 100.
Answer: 1,900
- 9,772 rounds to 9,800; 7,868 rounds to 7,900
- 9,800 − 7,900 = 1,900
The exact answer is 1,904, close to the estimate.
8.Estimate 72 × 68 by rounding each number to the nearest 10.
Answer: 4,900
- 72 rounds to 70; 68 rounds to 70
- 70 × 70 = 4,900
The exact answer is 4,896.
9.Estimate 87 × 4 by rounding 87 to the nearest 10.
Answer: 360
- 87 rounds to 90
- 90 × 4 = 360
The exact answer is 348.
10.Estimate 9,092 + 4,038 by rounding each number to the nearest 100.
Answer: 13,100
- 9,092 rounds to 9,100; 4,038 rounds to 4,000
- 9,100 + 4,000 = 13,100
The exact answer is 13,130, close to the estimate.
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