Printable · GCSE Foundation · ages 14-16
Rounding, significant figures and error intervals worksheet — GCSE Foundation
Fifteen questions on "rounding, significant figures and error intervals" — DfE statement N15. Print it, or print three versions so neighbours cannot copy by letter; the key gives the letter for each version.
Rounding, significant figures and error intervals worksheet — GCSE Foundation
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- 1.A number, y, is equal to 8.2 when rounded to 1 decimal place. Write down the error interval for y.
- 2.Round 0.0759 to 2 decimal places.
- 3.Round 592.5 to the nearest 10.
- 4.A number, n, is equal to 3.7 when rounded to 1 decimal place. Write down the error interval for n.
- 5.A recipe needs 0.485 kg of flour per cake. A bakery estimates its flour order by rounding this amount to 1 significant figure, then multiplying by the 60 cakes it plans to bake. Work out the bakery's estimate for the total flour needed, in kg.
- 6.Sam rounds 0.070268 to 3 significant figures and writes 0.0703. Which of these statements is correct?
- 7.Round 3.947 to 2 decimal places.
- 8.Round 6.283 to 1 significant figure.
- 9.A charity trek covers 830 miles over roughly 19 days. By rounding each number to 1 significant figure, work out an estimate for the number of miles walked per day.
- 10.To estimate the cost of buying 38.7 m of rope at £21.40 per metre, both numbers are first rounded to 1 significant figure. Work out the estimate.
- 11.Round 4,685 to the nearest 100.
- 12.A number, x, is truncated (not rounded) to 1 decimal place and the result is 6.2. Write down the error interval for x.
- 13.A tin of paint has a mass of 5.672 kg. Round this mass to 1 decimal place.
- 14.Four friends share a restaurant bill of £53.90 equally. A calculator gives each share as 13.475. Work out how much each friend should pay.
- 15.A measuring jug shows a volume of 340 ml, correct to the nearest 20 ml. Work out the smallest possible volume in the jug.
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