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 8,027 + 3,429 by rounding each number to the nearest 100.
Answer: 11,400
- 8,027 rounds to 8,000; 3,429 rounds to 3,400
- 8,000 + 3,400 = 11,400
The exact answer is 11,456, close to the estimate.
2.Estimate 17 × 89 by rounding each number to the nearest 10.
Answer: 1,800
- 17 rounds to 20; 89 rounds to 90
- 20 × 90 = 1,800
The exact answer is 1,513.
3.Estimate 88 × 58 by rounding each number to the nearest 10.
Answer: 5,400
- 88 rounds to 90; 58 rounds to 60
- 90 × 60 = 5,400
The exact answer is 5,104.
4.Estimate 7,875 − 6,947 by rounding each number to the nearest 1,000.
Answer: 1,000
- 7,875 rounds to 8,000; 6,947 rounds to 7,000
- 8,000 − 7,000 = 1,000
The exact answer is 928, close to the estimate.
5.Estimate 89 × 94 by rounding each number to the nearest 10.
Answer: 8,100
- 89 rounds to 90; 94 rounds to 90
- 90 × 90 = 8,100
The exact answer is 8,366.
6.Estimate 92 × 4 by rounding 92 to the nearest 10.
Answer: 360
- 92 rounds to 90
- 90 × 4 = 360
The exact answer is 368.
7.Estimate 7,157 + 3,696 by rounding each number to the nearest 100.
Answer: 10,900
- 7,157 rounds to 7,200; 3,696 rounds to 3,700
- 7,200 + 3,700 = 10,900
The exact answer is 10,853, close to the estimate.
8.Estimate 45 × 42 by rounding each number to the nearest 10.
Answer: 2,000
- 45 rounds to 50; 42 rounds to 40
- 50 × 40 = 2,000
The exact answer is 1,890.
9.Estimate 94 × 5 by rounding 94 to the nearest 10.
Answer: 450
- 94 rounds to 90
- 90 × 5 = 450
The exact answer is 470.
10.Estimate 3,875 + 6,524 by rounding each number to the nearest 1,000.
Answer: 11,000
- 3,875 rounds to 4,000; 6,524 rounds to 7,000
- 4,000 + 7,000 = 11,000
The exact answer is 10,399, 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.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
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