Year 3 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 2 — Answers
Answer sheet with worked solutions for the Year 3 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 3 · Mathematics · Place ValueYear 3 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 4,532 + 2,180 by rounding each number to the nearest 1,000.
Answer: 7,000
- 4,532 rounds to 5,000; 2,180 rounds to 2,000
- 5,000 + 2,000 = 7,000
The exact answer is 6,712, close to the estimate.
2.Estimate 96 × 19 by rounding each number to the nearest 10.
Answer: 2,000
- 96 rounds to 100; 19 rounds to 20
- 100 × 20 = 2,000
The exact answer is 1,824.
3.Estimate 61 × 6 by rounding 61 to the nearest 10.
Answer: 360
- 61 rounds to 60
- 60 × 6 = 360
The exact answer is 366.
4.Estimate 5,367 + 3,752 by rounding each number to the nearest 1,000.
Answer: 9,000
- 5,367 rounds to 5,000; 3,752 rounds to 4,000
- 5,000 + 4,000 = 9,000
The exact answer is 9,119, close to the estimate.
5.Estimate 86 × 98 by rounding each number to the nearest 10.
Answer: 9,000
- 86 rounds to 90; 98 rounds to 100
- 90 × 100 = 9,000
The exact answer is 8,428.
6.Estimate 26 × 15 by rounding each number to the nearest 10.
Answer: 600
- 26 rounds to 30; 15 rounds to 20
- 30 × 20 = 600
The exact answer is 390.
7.Estimate 4,952 + 6,560 by rounding each number to the nearest 1,000.
Answer: 12,000
- 4,952 rounds to 5,000; 6,560 rounds to 7,000
- 5,000 + 7,000 = 12,000
The exact answer is 11,512, close to the estimate.
8.Estimate 48 × 87 by rounding each number to the nearest 10.
Answer: 4,500
- 48 rounds to 50; 87 rounds to 90
- 50 × 90 = 4,500
The exact answer is 4,176.
9.Estimate 55 × 6 by rounding 55 to the nearest 10.
Answer: 360
- 55 rounds to 60
- 60 × 6 = 360
The exact answer is 330.
10.Estimate 9,909 − 1,515 by rounding each number to the nearest 1,000.
Answer: 8,000
- 9,909 rounds to 10,000; 1,515 rounds to 2,000
- 10,000 − 2,000 = 8,000
The exact answer is 8,394, close to the estimate.
Marking tips
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