Keystones — Cornerstone

Five GCSE retrieval questions · 13 June 2026 · mathsvault.uk/keystones

1. Number

900000

Answer: 9 × 10⁵
2. Algebra

Factorise: 20x + 35

Answer: 5(4x + 7)
3. Geometry

Calculate the hypotenuse when a = 8cm and b = 13cm

Answer: 15.26cm
4. Ratio

Simplify: 16:24:24

Answer: 2:3:3
5. Statistics

What is the probability of rolling a 6 on a fair die?

Answer: ¹⁄₆

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