Keystones — Capstone
Five GCSE retrieval questions · 23 April 2026 · mathsvault.uk/keystones
-
1. Number Rationalising the denominator
Rationalise: 4/√2
Answer: 4√2⁄2 -
2. Algebra Factorising non-monic quadratics
Factorise: 6x² -4x - 16
Answer: (2x - 4)(3x + 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 51°. Find opposite
Answer: 17.3cm -
4. Ratio Reverse percentages
A price of £582.92 includes a 18% increase. What was the price before the increase?
Answer: £494.00 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 33, 41, 38, what is the missing number?
Answer: 0