Keystones — Lintel
Five GCSE retrieval questions · 16 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.037
Answer: 3.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 61°. Find adjacent side
Answer: 7.8cm -
4. Ratio Mixed ratio problems
£258.00 is shared between A and B in the ratio 2:1. How much does A receive?
Answer: £172.00 -
5. Statistics Mean
Calculate the mean of: 21, 11, 21, 27, 17, 44, 7, 39
Answer: 23.4