Estimating worksheet
5 GCSE practice questions with answers, free to print. Every sheet is generated, so you can make a fresh one whenever you need it.
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3 marks
Three warehouses hold these numbers of boxes.
\(2,347\), \(3,180\), \(5,946\)
(a)Work out an estimate of the total, by rounding each number to the nearest 1000.
(b)Is your estimate bigger or smaller than the exact total?
Give a reason for your answer.
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3 marks
Find an estimate of 21% of 7554.
You must show your working.
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2 marks
Calculate an estimate of how many pieces can be cut from the roll.
You must show your working.
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3 marks
Joel uses a calculator to work out \(32.1 \times 32\).
He writes down the answer \(10272\).
(a)Calculate an estimate of \(32.1 \times 32\) by rounding each number to 1 significant figure.
(b)Explain how your estimate shows that Joel's answer is wrong.
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2 marks
Calculate an estimate of the cost of one printer.
You must show your working.
Answers
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(a) \(11000\)
(b) Smaller — the exact total is 11,473, so the estimate is out by 473. - \(1600\ \text{boxes}\)
- \(100\)
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(a) \(900\)
(b) The estimate is about 900, but Joel wrote \(10272\), which is far bigger than that. - \(\text{£}40\)