Keystones — Capstone
Five GCSE retrieval questions · 6 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: x² - 7x - 9
Answer: (x - 7⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 30cm, angle = 48°. Give your answer to 2 decimal places
Answer: 189.5cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 24:56:7 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 31, 31, 10, 33, 92, 46, 14
Answer: Mean = 44.25, Median = 32, Range = 87