Keystones — Lintel
Five GCSE retrieval questions · 12 April 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.043
Answer: 4.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 60°. Find opposite
Answer: 29.4cm -
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 20. If 3 of them are 43, 44, 19, what is the missing number?
Answer: -26