Keystones — Lintel
Five GCSE retrieval questions · 6 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00036
Answer: 3.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 30°. Find adjacent side
Answer: 13.9cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 28, 50, 42, 34, 47, what is the missing number?
Answer: -21