Keystones — Lintel
Five GCSE retrieval questions · 14 March 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
29000
Answer: 2.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 33°. Find opposite
Answer: 6.5cm -
4. Ratio Mixed ratio problems
Express the first part of 6:5 as a fraction in simplest form
Answer: 6⁄11 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 45, 24, 26, what is the missing number?
Answer: 13