Keystones — Capstone
Five GCSE retrieval questions · 6 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√40
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: 2x² - 16x - 2
Answer: 2(x - 4)² - 34 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 24cm, angle = 45°. Give your answer to 2 decimal places
Answer: 229.cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:15:3 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 58, 39, 14, 97, 75, 73. Give your answer to 2 decimal places
Answer: Mean = 59.43, Median = 60, Range = 83