Keystones — Lintel
Five GCSE retrieval questions · 4 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.012
Answer: 1.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 30°. Find opposite
Answer: 12.cm -
4. Ratio Mixed ratio problems
Express the first part of 3:4 as a fraction in simplest form
Answer: 3⁄7 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 31, 42, 16, 17, what is the missing number?
Answer: 39