Keystones — Lintel
Five GCSE retrieval questions · 18 December 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 - 8x + 12
Answer: (x - 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 30°. Find opposite
Answer: 5.8cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 19, 27, 41, what is the missing number?
Answer: 9