Keystones — Lintel
Five GCSE retrieval questions · 7 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0097
Answer: 9.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 55°. Find opposite
Answer: 20cm -
4. Ratio Mixed ratio problems
Divide 70 in the ratio 2:2:3
Answer: 20, 20 and 30 -
5. Statistics Mean
The mean of 4 numbers is 21. If 3 of them are 27, 36, 36, what is the missing number?
Answer: -15