Keystones — Lintel
Five GCSE retrieval questions · 10 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
75000000
Answer: 7.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x + 6
Answer: (x - 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 34°. Find opposite
Answer: 13.5cm -
4. Ratio Mixed ratio problems
Simplify: 20:24:16
Answer: 5:6:4 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 32, 21, 18, 23, what is the missing number?
Answer: 51