Keystones — Lintel
Five GCSE retrieval questions · 17 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
97000
Answer: 9.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 40°. Find adjacent side
Answer: 23.7cm -
4. Ratio Mixed ratio problems
£280.00 is shared between A and B in the ratio 3:4. How much does A receive?
Answer: £120.00 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 20, 24, 43, what is the missing number?
Answer: 57