Keystones — Lintel
Five GCSE retrieval questions · 6 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
83000
Answer: 8.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 32°. Find adjacent side
Answer: 15.3cm -
4. Ratio Mixed ratio problems
Express the first part of 5:3 as a fraction in simplest form
Answer: 5⁄8 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 45, 22, 30, what is the missing number?
Answer: 51