Keystones — Lintel
Five GCSE retrieval questions · 17 July 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00062
Answer: 6.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 31°. Find adjacent side
Answer: 20.6cm -
4. Ratio Mixed ratio problems
Express the first part of 2:3 as a fraction in simplest form
Answer: 2⁄5 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 21, 45, 43, 43, what is the missing number?
Answer: -22