Keystones — Capstone
Five GCSE retrieval questions · 1 August 2021 · 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 + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 29cm, angle = 46°
Answer: 250.3cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 1:2. Find a:b:c.
Answer: 8:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 66, 47, 85, 97, 49, 100, 61, 10
Answer: Mean = 64.9, Median = 66, Range = 90