Year 4 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 4 — 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 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 7,998 + 8,569 by rounding each number to the nearest 100.
Answer: 16,600
- 7,998 rounds to 8,000; 8,569 rounds to 8,600
- 8,000 + 8,600 = 16,600
The exact answer is 16,567, close to the estimate.
2.Estimate 87 × 98 by rounding each number to the nearest 10.
Answer: 9,000
- 87 rounds to 90; 98 rounds to 100
- 90 × 100 = 9,000
The exact answer is 8,526.
3.Estimate 31 × 5 by rounding 31 to the nearest 10.
Answer: 150
- 31 rounds to 30
- 30 × 5 = 150
The exact answer is 155.
4.Estimate 6,641 + 8,312 by rounding each number to the nearest 1,000.
Answer: 15,000
- 6,641 rounds to 7,000; 8,312 rounds to 8,000
- 7,000 + 8,000 = 15,000
The exact answer is 14,953, close to the estimate.
5.Estimate 54 × 79 by rounding each number to the nearest 10.
Answer: 4,000
- 54 rounds to 50; 79 rounds to 80
- 50 × 80 = 4,000
The exact answer is 4,266.
6.Estimate 31 × 4 by rounding 31 to the nearest 10.
Answer: 120
- 31 rounds to 30
- 30 × 4 = 120
The exact answer is 124.
7.Estimate 9,926 − 6,325 by rounding each number to the nearest 1,000.
Answer: 4,000
- 9,926 rounds to 10,000; 6,325 rounds to 6,000
- 10,000 − 6,000 = 4,000
The exact answer is 3,601, close to the estimate.
8.Estimate 69 × 26 by rounding each number to the nearest 10.
Answer: 2,100
- 69 rounds to 70; 26 rounds to 30
- 70 × 30 = 2,100
The exact answer is 1,794.
9.Estimate 51 × 65 by rounding each number to the nearest 10.
Answer: 3,500
- 51 rounds to 50; 65 rounds to 70
- 50 × 70 = 3,500
The exact answer is 3,315.
10.Estimate 8,535 + 6,686 by rounding each number to the nearest 100.
Answer: 15,200
- 8,535 rounds to 8,500; 6,686 rounds to 6,700
- 8,500 + 6,700 = 15,200
The exact answer is 15,221, close to the estimate.
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
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