Keystones — Cornerstone

Five GCSE retrieval questions · 16 July 2026 · mathsvault.uk/keystones

1. Number

800000

Answer: 8 × 10⁵
2. Algebra

Solve: x + 10 = 20

Answer: x = 10
3. Geometry

Opposite = 18cm, adjacent = 13cm. Calculate the angle

Answer: 54.2°
4. Ratio

Simplify: 24:8:16

Answer: 3:1:2
5. Statistics

Find the mean of: 6, 18, 16, 17

Answer: 14.25

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