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 6,119 − 1,045 by rounding each number to the nearest 100.
Answer: 5,100
- 6,119 rounds to 6,100; 1,045 rounds to 1,000
- 6,100 − 1,000 = 5,100
The exact answer is 5,074, close to the estimate.
2.Estimate 37 × 92 by rounding each number to the nearest 10.
Answer: 3,600
- 37 rounds to 40; 92 rounds to 90
- 40 × 90 = 3,600
The exact answer is 3,404.
3.Estimate 65 × 6 by rounding 65 to the nearest 10.
Answer: 420
- 65 rounds to 70
- 70 × 6 = 420
The exact answer is 390.
4.Estimate 7,570 + 8,980 by rounding each number to the nearest 1,000.
Answer: 17,000
- 7,570 rounds to 8,000; 8,980 rounds to 9,000
- 8,000 + 9,000 = 17,000
The exact answer is 16,550, close to the estimate.
5.Estimate 69 × 72 by rounding each number to the nearest 10.
Answer: 4,900
- 69 rounds to 70; 72 rounds to 70
- 70 × 70 = 4,900
The exact answer is 4,968.
6.Estimate 31 × 3 by rounding 31 to the nearest 10.
Answer: 90
- 31 rounds to 30
- 30 × 3 = 90
The exact answer is 93.
7.Estimate 4,789 + 6,354 by rounding each number to the nearest 100.
Answer: 11,200
- 4,789 rounds to 4,800; 6,354 rounds to 6,400
- 4,800 + 6,400 = 11,200
The exact answer is 11,143, close to the estimate.
8.Estimate 95 × 22 by rounding each number to the nearest 10.
Answer: 2,000
- 95 rounds to 100; 22 rounds to 20
- 100 × 20 = 2,000
The exact answer is 2,090.
9.Estimate 54 × 8 by rounding 54 to the nearest 10.
Answer: 400
- 54 rounds to 50
- 50 × 8 = 400
The exact answer is 432.
10.Estimate 9,810 − 9,267 by rounding each number to the nearest 1,000.
Answer: 1,000
- 9,810 rounds to 10,000; 9,267 rounds to 9,000
- 10,000 − 9,000 = 1,000
The exact answer is 543, close to the estimate.
Marking tips
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