Keystones — Lintel
Five GCSE retrieval questions · 9 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
150000
Answer: 1.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 30°. Find opposite
Answer: 11cm -
4. Ratio Mixed ratio problems
In ratio 4:4:3, what fraction is the second part?
Answer: 4⁄11 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 40, 49, 24, 29, what is the missing number?
Answer: 3