EDEXCEL GCSE MATHS · FOUNDATION & HIGHER
Exam Practice: Ratio and Proportion
Ratio and proportion · Fractions, ratio and percentages · Lesson 3 of 5 · 10 marks · 20 minutes
Name Date
Answer all questions. Show your working.
Question 1 CALCULATOR [3 marks]
A recipe for 8 biscuits uses 120 g of butter and 200 g of flour. Jo wants to make 20 biscuits. She has 250 g of butter. Does she have enough butter? Show how you decide.
Question 2 CALCULATOR [3 marks]
Toothpaste is sold in two sizes: 75 ml for £1.80 and 125 ml for £2.85. Which is the better value? You must show your working.
Question 3 CALCULATOR [2 marks]
It takes 5 machines 12 hours to make an order. How long would 3 machines take, working at the same rate?
Question 4 CALCULATOR [2 marks]
The exchange rate is £1 = $1.26. Lara changes £350 into dollars. How many dollars does she get?
Answers
Check your answer only once you have written one.
Question 1 [3 marks]
One biscuit uses 120 ÷ 8 = 15 g of butter. 20 biscuits need 20 × 15 = 300 g. She has 250 g, so she does not have enough.
▸ 120 ÷ 8 or 20 ÷ 8 = 2.5 P1
▸ 300 g A1
▸ No, with 300 g compared to 250 g C1
Question 2 [3 marks]
75 ml: 180 ÷ 75 = 2.4p per ml. 125 ml: 285 ÷ 125 = 2.28p per ml. The 125 ml tube is better value.
▸ A correct method to compare, e.g. price per ml for one size M1
▸ Both correct: 2.4p and 2.28p per ml A1
▸ 125 ml, from correct figures C1
Question 3 [2 marks]
5 × 12 = 60 machine-hours. 60 ÷ 3 = 20 hours.
▸ 5 × 12 or 60 M1
▸ 20 hours A1
Question 4 [2 marks]
350 × 1.26 = 441 dollars
▸ 350 × 1.26 M1
▸ $441 A1