Keystones — Cornerstone
Five GCSE retrieval questions · 14 September 2026 · mathsvault.uk/keystones
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1. Number Multiplying fractions
Calculate: 2⁄5 × 4
Answer: 8⁄5 -
2. Algebra Expanding single brackets
Expand: 4(x + 6)
Answer: 4x + 24 -
3. Geometry Pythagoras — short side
Find b if a = 10cm and c = 17cm
Answer: 13.75cm -
4. Ratio Ratio given the difference
In ratio 3:1, the difference between shares is 60. What are the shares?
Answer: 90 and 30 -
5. Statistics Range
Calculate the range of: 68, 27, 28, 39, 82, 42
Answer: 55