Keystones — Lintel
Five GCSE retrieval questions · 25 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
25000
Answer: 2.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 65°. Find adjacent side
Answer: 16.5cm -
4. Ratio Mixed ratio problems
£100.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £40.00 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 26, 47, 24, 44, 30, what is the missing number?
Answer: 9