Keystones — Lintel
Five GCSE retrieval questions · 27 October 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
16000000
Answer: 1.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 26°. Find adjacent side
Answer: 36cm -
4. Ratio Mixed ratio problems
Divide 88 in the ratio 3:4:1
Answer: 33, 44 and 11 -
5. Statistics Mean
Calculate the mean of: 25, 15, 28, 10, 7, 10, 41, 29
Answer: 20.6