Keystones — Lintel

Five GCSE retrieval questions · 14 September 2025 · mathsvault.uk/keystones

1. Number

Calculate: ⁴⁄₆ + ⁴⁄₆ + ¹⁄₄

Answer: ¹⁹⁄₁₂
2. Algebra

Factorise fully: 10x² + 12x

Answer: 2x(5x + 6)
3. Geometry

Opposite = 9cm, adjacent = 18cm. Calculate the angle

Answer: 26.6°
4. Ratio

Simplify: 16:8:20

Answer: 4:2:5
5. Statistics

A bag has 4 red and 7 blue balls. What is the probability of picking a red ball?

Answer: ⁴⁄₁₁

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