Keystones — Lintel
Five GCSE retrieval questions · 4 September 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
4600000
Answer: 4.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 45°. Find opposite
Answer: 10cm -
4. Ratio Mixed ratio problems
Simplify: 9:6:15
Answer: 3:2:5 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 16, 36, 37, what is the missing number?
Answer: 67