Keystones — Capstone
Five GCSE retrieval questions · 13 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 2x² - 12x - 8
Answer: 2(x - 3)² - 26 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 12cm, angle = 59°. Give your answer to 2 decimal places
Answer: 123.43cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 3:6:4 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 76, 27, 35, 54, 75, 82, 62
Answer: Mean = 63.5, Median = 68.5, Range = 70