Keystones — Lintel
Five GCSE retrieval questions · 30 October 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 71 + ? = 102
Answer: 31 -
2. Algebra
Factorise fully: 35x² + 25x
Answer: 5x(7x + 5) -
3. Geometry
Opposite = 8cm, adjacent = 13cm. Calculate the angle
Answer: 31.6° -
4. Ratio
Simplify: 20:16:20
Answer: 5:4:5 -
5. Statistics
A spinner has 5 red, 3 blue and 6 green sections. Probability of landing on red?
Answer: 5⁄14