Keystones — Lintel
Five GCSE retrieval questions · 5 May 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0034
Answer: 3.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 50°. Find adjacent side
Answer: 20.6cm -
4. Ratio Mixed ratio problems
Divide 300 in the ratio 2:2:1
Answer: 120, 120 and 60 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 26, 28, 16, what is the missing number?
Answer: 26