Keystones — Cornerstone
Five GCSE retrieval questions · 15 January 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 34 + 57
Answer: 34 + 57 = 91 -
2. Algebra
Expand: 5(x + 3)
Answer: 5x + 15 -
3. Geometry
Find the perimeter of a right triangle with sides 6cm, 8cm, 10cm
Answer: 24cm -
4. Ratio
Simplify the ratio 24:18
Answer: 4:3 -
5. Statistics
Calculate the mean of: 19, 39, 29, 26, 34, 19, 7, 39
Answer: 26.5