Keystones — Lintel
Five GCSE retrieval questions · 10 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
1800000
Answer: 1.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 41°. Find adjacent side
Answer: 30.2cm -
4. Ratio Mixed ratio problems
In ratio 3:1:1, what fraction is the second part?
Answer: 1⁄5 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 45, 33, 35, what is the missing number?
Answer: 27