Keystones — Lintel
Five GCSE retrieval questions · 20 July 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 78 + ? = 175
Answer: 97 -
2. Algebra
Factorise fully: 16x² + 12x
Answer: 4x(4x + 3) -
3. Geometry
Opposite = 18cm, adjacent = 15cm. Calculate the angle
Answer: 50.2° -
4. Ratio
Find 64% of 198
Answer: 126.72 -
5. Statistics
A spinner has 6 red, 6 blue and 3 green sections. Probability of landing on red?
Answer: 2⁄5