Keystones — Lintel
Five GCSE retrieval questions · 28 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
810000
Answer: 8.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 46°. Find opposite
Answer: 29cm -
4. Ratio Mixed ratio problems
In ratio 2:4:3, what fraction is the second part?
Answer: 4⁄9 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 23, 44, 38, 45, 42, what is the missing number?
Answer: 36