Keystones — Lintel
Five GCSE retrieval questions · 21 April 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 994 + 642
Answer: 1636 -
2. Algebra
Factorise: 4x² + 4x
Answer: 4x(x + 1) -
3. Geometry
Opposite = 12cm, adjacent = 13cm. Calculate the angle
Answer: 42.7° -
4. Ratio
Simplify the ratio 6m:600cm
Answer: 1:100 -
5. Statistics
A bag has 6 red and 7 blue balls. What is the probability of picking a red ball?
Answer: 6⁄13