Keystones — Lintel
Five GCSE retrieval questions · 28 July 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
540000
Answer: 5.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 41°. Find opposite
Answer: 18.3cm -
4. Ratio Mixed ratio problems
Divide 120 in the ratio 2:1:2
Answer: 48, 24 and 48 -
5. Statistics Mean
The mean of 6 numbers is 27. If 5 of them are 22, 37, 23, 36, 37, what is the missing number?
Answer: 7