Keystones — Lintel
Five GCSE retrieval questions · 6 May 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
6000000
Answer: 6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 58°. Find opposite
Answer: 41.6cm -
4. Ratio Mixed ratio problems
Divide 154 in the ratio 1:2:4
Answer: 22, 44 and 88 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 23, 26, 34, what is the missing number?
Answer: 25