Keystones — Capstone
Five GCSE retrieval questions · 17 February 2025 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 30cm, angle = 56°
Answer: 161.7cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:5. Find a:b:c.
Answer: 4:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 37, 85, 84, 40, 40, 51, 96
Answer: Mean = 60.1, Median = 51, Range = 59