Keystones — Lintel
Five GCSE retrieval questions · 26 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0006
Answer: 6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 42°. Find opposite
Answer: 18cm -
4. Ratio Mixed ratio problems
£288.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £128.00 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 32, 23, 33, 50, what is the missing number?
Answer: -3