Keystones — Lintel
Five GCSE retrieval questions · 21 May 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00087
Answer: 8.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 36°. Find opposite
Answer: 17.4cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 43, 46, 16, 24, what is the missing number?
Answer: 66