Keystones — Lintel
Five GCSE retrieval questions · 27 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
360000
Answer: 3.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 57°. Find opposite
Answer: 15.4cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m:500cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 15, 23, 42, 25, what is the missing number?
Answer: 70