Keystones — Capstone
Five GCSE retrieval questions · 4 February 2025 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 13cm, angle = 48°
Answer: 58cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:5. Find a:b:c.
Answer: 2:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 56, 87, 10, 24, 42, 88
Answer: Mean = 46, Median = 42, Range = 78