Keystones — Lintel
Five GCSE retrieval questions · 15 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
55000
Answer: 5.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 62°. Find adjacent side
Answer: 17.4cm -
4. Ratio Mixed ratio problems
Simplify: 15:9:9
Answer: 5:3:3 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 30, 40, 42, what is the missing number?
Answer: 36