Keystones — Lintel
Five GCSE retrieval questions · 21 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
63000000
Answer: 6.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 8
Answer: (x - 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 32°. Find adjacent side
Answer: 21.2cm -
4. Ratio Mixed ratio problems
£130.00 is shared between A and B in the ratio 3:2. How much does A receive?
Answer: £78.00 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 16, 45, 28, what is the missing number?
Answer: 19