Keystones — Lintel
Five GCSE retrieval questions · 27 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00049
Answer: 4.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 56°. Find opposite
Answer: 16.3cm -
4. Ratio Mixed ratio problems
Divide 70 in the ratio 3:1:1
Answer: 42, 14 and 14 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 25, 32, 45, 43, what is the missing number?
Answer: 30