Keystones — Lintel
Five GCSE retrieval questions · 22 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
9800000
Answer: 9.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 43°. Find opposite
Answer: 26.cm -
4. Ratio Mixed ratio problems
In ratio 4:2:3, what fraction is the second part?
Answer: 2⁄9 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 26, 20, 37, 16, what is the missing number?
Answer: 91