Keystones — Lintel
Five GCSE retrieval questions · 14 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00035
Answer: 3.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 42°. Find adjacent side
Answer: 25.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 40, 15, 46, 20, 48, what is the missing number?
Answer: 65