Keystones — Capstone
Five GCSE retrieval questions · 13 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√8
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: 2x² - 12x + 15
Answer: 2(x - 3)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 26cm, angle = 72°. Give your answer to 2 decimal places
Answer: 185.46cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 81:45:40 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 10, 75, 22, 40, 24, 79, 92
Answer: Mean = 52.25, Median = 57.5, Range = 82