Keystones — Lintel
Five GCSE retrieval questions · 28 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
78000000
Answer: 7.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 64°. Find adjacent side
Answer: 7cm -
4. Ratio Mixed ratio problems
£186.00 is shared between A and B in the ratio 2:1. How much does A receive?
Answer: £124.00 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 38, 28, 16, what is the missing number?
Answer: 74