Keystones — Cornerstone

Five GCSE retrieval questions · 26 July 2026 · mathsvault.uk/keystones

1. Number

50000

Answer: 5 × 10⁴
2. Algebra

Solve: 7x - 9 = 3x + -1

Answer: x = 2
3. Geometry

Calculate the area of a circle with diameter 24cm

Answer: 452.39cm²
4. Ratio

Calculate 25% of 153

Answer: 38.25
5. Statistics

Calculate the mean of: 10, 8, 28, 38, 34, 31

Answer: 24.8

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