Keystones — Lintel
Five GCSE retrieval questions · 3 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
800000
Answer: 8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 25°. Find adjacent side
Answer: 19.9cm -
4. Ratio Mixed ratio problems
Express the first part of 5:2 as a fraction in simplest form
Answer: 5⁄7 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 24, 18, 18, what is the missing number?
Answer: 40