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 block of butter has a mass of 250 g, correct to the nearest 10 g. Using m for the mass of the block in grams, write down the error interval for m.
- 2.A digital timer truncates every time to 1 decimal place. It shows a swimmer's time for one length as 12.3 seconds. Using t for the swimmer's actual time in seconds, write down the error interval for t.
- 3.Round 592.5 to the nearest 10.
- 4.Round 0.0759 to 2 decimal places.
- 5.Round 3.947 to 2 decimal places.
- 6.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.
- 7.A quantity surveyor calculates a length as 24.6851 m. Round this length to 2 decimal places.
- 8.The thickness of a sheet of card is 0.02384 cm. Write this thickness correct to 2 significant figures.
- 9.Round 6.283 to 1 significant figure.
- 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 24,681 to the nearest 1,000.
- 12.Sam rounds 0.070268 to 3 significant figures and writes 0.0703. Which of these statements is correct?
- 13.A number, x, is truncated (not rounded) to 1 decimal place and the result is 6.2. Write down the error interval for x.
- 14.A number, y, is equal to 8.2 when rounded to 1 decimal place. Write down the error interval for y.
- 15.A tin of paint has a mass of 5.672 kg. Round this mass to 1 decimal place.
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