Keystones — Lintel
Five GCSE retrieval questions · 22 May 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
6900000
Answer: 6.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 48°. Find adjacent side
Answer: 26.cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 35, 26, 19, 15, 29, what is the missing number?
Answer: 50