Keystones — Lintel
Five GCSE retrieval questions · 24 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.008
Answer: 8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 30°. Find adjacent side
Answer: 24.2cm -
4. Ratio Mixed ratio problems
Divide 104 in the ratio 1:2:1
Answer: 26, 52 and 26 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 18, 24, 22, 42, 48, what is the missing number?
Answer: 86