Keystones — Cornerstone

Five GCSE retrieval questions · 24 January 2026 · mathsvault.uk/keystones

1. Number

Add: ⁵⁄₇ + ¹⁄₄

Answer: ²⁷⁄₂₈
2. Algebra

Factorise: 6x + 24

Answer: 3(2x + 8)
3. Geometry

Opposite = 19cm, adjacent = 11cm. Calculate the angle

Answer: 59.9°
4. Ratio

Find 25% of 262

Answer: 65.5
5. Statistics

Calculate the mean of: 32, 23, 17, 49, 28, 13, 41

Answer: 29

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