Keystones — Lintel
Five GCSE retrieval questions · 17 March 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.009
Answer: 9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 46°. Find adjacent side
Answer: 16cm -
4. Ratio Mixed ratio problems
Simplify: 8:6:4
Answer: 4:3:2 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 23, 22, 32, what is the missing number?
Answer: 31