Keystones — Lintel
Five GCSE retrieval questions · 9 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.079
Answer: 7.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 61°. Find adjacent side
Answer: 17cm -
4. Ratio Mixed ratio problems
£272.00 is shared between A and B in the ratio 3:5. How much does A receive?
Answer: £102.00 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 35, 40, 25, 40, 48, what is the missing number?
Answer: -8