Keystones — Capstone
Five GCSE retrieval questions · 6 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√275
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: 2x² - 24x - 6
Answer: 2(x - 6)² - 78 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 16cm, angle = 66°. Give your answer to 2 decimal places
Answer: 131.55cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 14:18:9 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 64, 12, 82, 26, 75, 72, 100
Answer: Mean = 57.75, Median = 68, Range = 88