Keystones — Lintel
Five GCSE retrieval questions · 6 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
240000
Answer: 2.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 34°. Find opposite
Answer: 14.2cm -
4. Ratio Mixed ratio problems
£175.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £70.00 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 39, 16, 41, 39, what is the missing number?
Answer: 65