Keystones — Cornerstone
Five GCSE retrieval questions · 12 January 2026 · mathsvault.uk/keystones
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1. Number Multiplying fractions
Multiply: 2⁄3 × 2⁄7
Answer: 4⁄21 -
2. Algebra Expanding single brackets
Expand: 7(x + 9)
Answer: 7x + 63 -
3. Geometry Pythagoras — short side
In a right triangle, if c = 5cm and a = 3cm, find b
Answer: 4cm -
4. Ratio Ratio given the difference
A and B share in ratio 5:4. If the difference is 39, what does A get?
Answer: 195 -
5. Statistics Range
Find the range of: 13, 24, 24, 13, 13
Answer: 11