Keystones — Lintel
Five GCSE retrieval questions · 8 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00093
Answer: 9.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 60°. Find opposite
Answer: 24.2cm -
4. Ratio Mixed ratio problems
Simplify: 6:6:8
Answer: 3:3:4 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 47, 22, 36, what is the missing number?
Answer: -13