Keystones — Capstone
Five GCSE retrieval questions · 22 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√50
Answer: 15√2 -
2. Algebra Completing the square
Complete the square: x² - x + 7
Answer: (x - 1⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 29cm, angle = 65°. Give your answer to 2 decimal places
Answer: 381.cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 14:21:3 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 63, 83, 80, 58, 84, 16, 13
Answer: Mean = 58, Median = 65, Range = 71