Year 5 Estimating Sums, Differences and Products Worksheet — Level 3 — 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 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 1,089 + 9,119 by rounding each number to the nearest 1,000.
Answer: 10,000
- 1,089 rounds to 1,000; 9,119 rounds to 9,000
- 1,000 + 9,000 = 10,000
The exact answer is 10,208, close to the estimate.
2.Estimate 33 × 42 by rounding each number to the nearest 10.
Answer: 1,200
- 33 rounds to 30; 42 rounds to 40
- 30 × 40 = 1,200
The exact answer is 1,386.
3.Estimate 38 × 41 by rounding each number to the nearest 10.
Answer: 1,600
- 38 rounds to 40; 41 rounds to 40
- 40 × 40 = 1,600
The exact answer is 1,558.
4.Estimate 9,162 − 1,997 by rounding each number to the nearest 1,000.
Answer: 7,000
- 9,162 rounds to 9,000; 1,997 rounds to 2,000
- 9,000 − 2,000 = 7,000
The exact answer is 7,165, close to the estimate.
5.Estimate 73 × 39 by rounding each number to the nearest 10.
Answer: 2,800
- 73 rounds to 70; 39 rounds to 40
- 70 × 40 = 2,800
The exact answer is 2,847.
6.Estimate 78 × 45 by rounding each number to the nearest 10.
Answer: 4,000
- 78 rounds to 80; 45 rounds to 50
- 80 × 50 = 4,000
The exact answer is 3,510.
7.Estimate 5,020 − 1,135 by rounding each number to the nearest 1,000.
Answer: 4,000
- 5,020 rounds to 5,000; 1,135 rounds to 1,000
- 5,000 − 1,000 = 4,000
The exact answer is 3,885, close to the estimate.
8.Estimate 19 × 83 by rounding each number to the nearest 10.
Answer: 1,600
- 19 rounds to 20; 83 rounds to 80
- 20 × 80 = 1,600
The exact answer is 1,577.
9.Estimate 28 × 8 by rounding 28 to the nearest 10.
Answer: 240
- 28 rounds to 30
- 30 × 8 = 240
The exact answer is 224.
10.Estimate 3,004 + 2,604 by rounding each number to the nearest 1,000.
Answer: 6,000
- 3,004 rounds to 3,000; 2,604 rounds to 3,000
- 3,000 + 3,000 = 6,000
The exact answer is 5,608, 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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