Keystones — Lintel
Five GCSE retrieval questions · 22 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
4000000
Answer: 4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 56°. Find adjacent side
Answer: 21.2cm -
4. Ratio Mixed ratio problems
Express the first part of 3:6 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 45, 35, 34, what is the missing number?
Answer: 18