Keystones — Lintel
Five GCSE retrieval questions · 14 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
42000
Answer: 4.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 41°. Find opposite
Answer: 11.3cm -
4. Ratio Mixed ratio problems
£350.00 is shared between A and B in the ratio 4:3. How much does A receive?
Answer: £200.00 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 41, 45, 31, 29, 30, what is the missing number?
Answer: 22