Keystones — Lintel
Five GCSE retrieval questions · 20 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
340000
Answer: 3.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 16
Answer: (x - 4)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 47°. Find adjacent side
Answer: 17.7cm -
4. Ratio Mixed ratio problems
£243.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £108.00 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 20, 16, 50, 41, what is the missing number?
Answer: 38