Keystones — Lintel
Five GCSE retrieval questions · 12 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0082
Answer: 8.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 49°. Find adjacent side
Answer: 26.2cm -
4. Ratio Mixed ratio problems
Express the first part of 5:2 as a fraction in simplest form
Answer: 5⁄7 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 24, 42, 36, what is the missing number?
Answer: 18