Keystones — Lintel
Five GCSE retrieval questions · 2 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0075
Answer: 7.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 25
Answer: (x - 5)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 56°. Find opposite
Answer: 23.7cm -
4. Ratio Mixed ratio problems
£240.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £96.00 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 38, 50, 40, 15, 18, what is the missing number?
Answer: 7