Keystones — Lintel
Five GCSE retrieval questions · 15 May 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
83000000
Answer: 8.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 36
Answer: (x - 6)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 64°. Find adjacent side
Answer: 14.5cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 50, 24, 49, what is the missing number?
Answer: 25