Keystones — Capstone
Five GCSE retrieval questions · 21 February 2025 · 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 + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 12cm, angle = 79°
Answer: 106cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 16:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 54, 15, 32, 31, 65, 88
Answer: Mean = 44.3, Median = 32, Range = 73