Keystones — Cornerstone

Five GCSE retrieval questions · 17 May 2025 · mathsvault.uk/keystones

1. Number

Simplify: 3³ × 3³

Answer: 3⁶
2. Algebra

Factorise: 4x + 16

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

Find the hypotenuse of a right triangle with sides 8cm and 15cm

Answer: 17cm
4. Ratio

Calculate 25% of 123

Answer: 30.75
5. Statistics

Find the mean of: 20, 10, 12

Answer: 14

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