Keystones — Capstone
Five GCSE retrieval questions · 20 March 2025 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 30cm, angle = 70°
Answer: 422.9cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:4. Find a:b:c.
Answer: 12:6:8 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 67, 13, 88, 10, 100, 60, 69, 55
Answer: Mean = 59.1, Median = 67, Range = 90