Keystones — Lintel
Five GCSE retrieval questions · 24 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
71000000
Answer: 7.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 47°. Find adjacent side
Answer: 18.4cm -
4. Ratio Mixed ratio problems
£210.00 is shared between A and B in the ratio 2:1. How much does A receive?
Answer: £140.00 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 23, 37, 27, what is the missing number?
Answer: 53