Keystones — Lintel
Five GCSE retrieval questions · 3 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.061
Answer: 6.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 40°. Find adjacent side
Answer: 30.6cm -
4. Ratio Mixed ratio problems
Express the first part of 6:3 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 18, 24, 23, 16, what is the missing number?
Answer: 114