Year 5 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 4 — 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 — Practice Set 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 7,803 − 7,413 by rounding each number to the nearest 100.
Answer: 400
- 7,803 rounds to 7,800; 7,413 rounds to 7,400
- 7,800 − 7,400 = 400
The exact answer is 390, close to the estimate.
2.Estimate 83 × 81 by rounding each number to the nearest 10.
Answer: 6,400
- 83 rounds to 80; 81 rounds to 80
- 80 × 80 = 6,400
The exact answer is 6,723.
3.Estimate 75 × 3 by rounding 75 to the nearest 10.
Answer: 240
- 75 rounds to 80
- 80 × 3 = 240
The exact answer is 225.
4.Estimate 3,566 − 1,835 by rounding each number to the nearest 100.
Answer: 1,800
- 3,566 rounds to 3,600; 1,835 rounds to 1,800
- 3,600 − 1,800 = 1,800
The exact answer is 1,731, close to the estimate.
5.Estimate 45 × 37 by rounding each number to the nearest 10.
Answer: 2,000
- 45 rounds to 50; 37 rounds to 40
- 50 × 40 = 2,000
The exact answer is 1,665.
6.Estimate 62 × 5 by rounding 62 to the nearest 10.
Answer: 300
- 62 rounds to 60
- 60 × 5 = 300
The exact answer is 310.
7.Estimate 9,766 − 5,783 by rounding each number to the nearest 100.
Answer: 4,000
- 9,766 rounds to 9,800; 5,783 rounds to 5,800
- 9,800 − 5,800 = 4,000
The exact answer is 3,983, close to the estimate.
8.Estimate 85 × 48 by rounding each number to the nearest 10.
Answer: 4,500
- 85 rounds to 90; 48 rounds to 50
- 90 × 50 = 4,500
The exact answer is 4,080.
9.Estimate 36 × 4 by rounding 36 to the nearest 10.
Answer: 160
- 36 rounds to 40
- 40 × 4 = 160
The exact answer is 144.
10.Estimate 7,339 − 4,961 by rounding each number to the nearest 100.
Answer: 2,300
- 7,339 rounds to 7,300; 4,961 rounds to 5,000
- 7,300 − 5,000 = 2,300
The exact answer is 2,378, 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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