Keystones — Lintel
Five GCSE retrieval questions · 3 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
62000
Answer: 6.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 47°. Find adjacent side
Answer: 15.7cm -
4. Ratio Mixed ratio problems
£240.00 is shared between A and B in the ratio 1:2. How much does A receive?
Answer: £80.00 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 27, 18, 17, 31, what is the missing number?
Answer: 32