Keystones — Lintel
Five GCSE retrieval questions · 5 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.084
Answer: 8.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 56°. Find adjacent side
Answer: 8.9cm -
4. Ratio Mixed ratio problems
In ratio 3:4:3, what fraction is the second part?
Answer: 4⁄10 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 40, 35, 35, what is the missing number?
Answer: 50