Keystones — Lintel
Five GCSE retrieval questions · 6 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0083
Answer: 8.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 49
Answer: (x - 7)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 26°. Find adjacent side
Answer: 24.3cm -
4. Ratio Mixed ratio problems
Express the first part of 5:4 as a fraction in simplest form
Answer: 5⁄9 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 18, 24, 16, 23, what is the missing number?
Answer: 119