Keystones — Lintel
Five GCSE retrieval questions · 19 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.099
Answer: 9.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 42°. Find adjacent side
Answer: 23cm -
4. Ratio Mixed ratio problems
£287.00 is shared between A and B in the ratio 5:2. How much does A receive?
Answer: £205.00 -
5. Statistics Mean
The mean of 5 numbers is 24. If 4 of them are 21, 28, 30, 27, what is the missing number?
Answer: 14