Keystones — Lintel
Five GCSE retrieval questions · 8 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
960000
Answer: 9.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 41°. Find adjacent side
Answer: 18.9cm -
4. Ratio Mixed ratio problems
Express the first part of 6:2 as a fraction in simplest form
Answer: 3⁄4 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 21, 18, 45, what is the missing number?
Answer: -4