Keystones — Lintel
Five GCSE retrieval questions · 25 May 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.048
Answer: 4.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 56°. Find opposite
Answer: 28.2cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 29, 18, 27, 43, 23, what is the missing number?
Answer: 34