Keystones — Lintel
Five GCSE retrieval questions · 28 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0074
Answer: 7.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 59°. Find opposite
Answer: 49.9cm -
4. Ratio Mixed ratio problems
£343.00 is shared between A and B in the ratio 2:5. How much does A receive?
Answer: £98.00 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 25, 40, 18, 25, 27, what is the missing number?
Answer: 81