Keystones — Lintel
Five GCSE retrieval questions · 27 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0049
Answer: 4.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 14
Answer: (x - 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 60°. Find opposite
Answer: 17.3cm -
4. Ratio Mixed ratio problems
£280.00 is shared between A and B in the ratio 3:5. How much does A receive?
Answer: £105.00 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 36, 22, 46, 33, what is the missing number?
Answer: -27