Keystones — Lintel
Five GCSE retrieval questions · 7 March 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 93 + ? = 123
Answer: 30 -
2. Algebra
Factorise: 8x² + 9x
Answer: x(8x + 9) -
3. Geometry
Adjacent = 30cm, hypotenuse = 50cm. Find the angle
Answer: 53.1° -
4. Ratio
Find 42% of 183
Answer: 76.86 -
5. Statistics
Calculate the mean of: 16, 22, 31, 40, 12, 37
Answer: 26.3