Keystones — Lintel
Five GCSE retrieval questions · 23 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.024
Answer: 2.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 43°. Find opposite
Answer: 22.4cm -
4. Ratio Mixed ratio problems
£342.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £190.00 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 24, 25, 21, 22, 24, what is the missing number?
Answer: 106