EDEXCEL GCSE MATHS · FOUNDATION & HIGHER
Exam Practice: Units and Accuracy
Units and accuracy · Area and volume · Lesson 2 of 7 · 8 marks · 20 minutes
Name Date
Answer all questions. Show your working. The calculator is allowed where the question says so.
Question 1 NON-CALCULATOR [1 mark]
Change 3.5 m² into cm².
Question 2 NON-CALCULATOR [2 marks]
A fish tank is a cuboid 80 cm long, 50 cm wide and 60 cm high. How many litres of water does it hold when full?
Question 3 NON-CALCULATOR [2 marks]
The length of a pencil, l cm, is 14 cm correct to the nearest centimetre. Write down the error interval for l.
Question 4 CALCULATOR · HIGHER [3 marks]
A runner covers a distance of 100 m, measured to the nearest metre, in a time of 12.5 s, measured to 1 decimal place. Work out the upper bound of the runner's average speed. Give your answer to 3 significant figures.
Answers
Check your answer only once you have written one.
Question 1 [1 mark]
3.5 × 10 000 = 35 000 cm²
▸ 35 000 B1
Question 2 [2 marks]
80 × 50 × 60 = 240 000 cm³. 240 000 ÷ 1000 = 240 litres.
▸ 80 × 50 × 60 M1
▸ 240 litres A1
Question 3 [2 marks]
13.5 ≤ l < 14.5
▸ 13.5 and 14.5 B1
▸ 13.5 ≤ l < 14.5 B1
Question 4 [3 marks]
Upper bound = 100.5/12.45 = 8.0722…= 8.07 m/s
▸ 100.5 or 12.45 seen B1
▸ 100.5/12.45 M1
▸ 8.07 A1