Keystones — Lintel
Five GCSE retrieval questions · 19 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
21000000
Answer: 2.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 38°. Find adjacent side
Answer: 17.3cm -
4. Ratio Mixed ratio problems
£222.00 is shared between A and B in the ratio 2:1. How much does A receive?
Answer: £148.00 -
5. Statistics Mean
The mean of 6 numbers is 23. If 5 of them are 38, 32, 43, 35, 39, what is the missing number?
Answer: -49