Keystones — Lintel
Five GCSE retrieval questions · 15 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
3900000
Answer: 3.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 60°. Find opposite
Answer: 24.2cm -
4. Ratio Mixed ratio problems
£125.00 is shared between A and B in the ratio 3:2. How much does A receive?
Answer: £75.00 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 38, 16, 47, what is the missing number?
Answer: 19