Keystones — Lintel
Five GCSE retrieval questions · 7 March 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
23000000
Answer: 2.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 36°. Find adjacent side
Answer: 24.3cm -
4. Ratio Mixed ratio problems
In ratio 1:1:3, what fraction is the second part?
Answer: 1⁄5 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 19, 32, 39, 34, what is the missing number?
Answer: 16