Keystones — Lintel
Five GCSE retrieval questions · 18 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
82000
Answer: 8.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 55°. Find adjacent side
Answer: 20.cm -
4. Ratio Mixed ratio problems
Divide 152 in the ratio 2:1:1
Answer: 76, 38 and 38 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 43, 46, 46, 44, what is the missing number?
Answer: -34