Keystones — Lintel
Five GCSE retrieval questions · 13 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00068
Answer: 6.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 30°. Find adjacent side
Answer: 18.2cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m:500cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 28, 45, 47, 40, what is the missing number?
Answer: 30