Keystones — Capstone
Five GCSE retrieval questions · 30 November 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 15cm, angle = 43°
Answer: 61.4cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 1:3. Find a:b:c.
Answer: 8:6:18 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 95, 39, 31, 49, 15, 62
Answer: Mean = 46.4, Median = 39, Range = 80