Keystones — Lintel
Five GCSE retrieval questions · 15 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0017
Answer: 1.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 44°. Find opposite
Answer: 21.2cm -
4. Ratio Mixed ratio problems
£189.00 is shared between A and B in the ratio 4:3. How much does A receive?
Answer: £108.00 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 43, 25, 47, 50, 31, what is the missing number?
Answer: 20