Keystones — Cornerstone
Five GCSE retrieval questions · 9 February 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 72 + 80
Answer: 72 + 80 = 152 -
2. Algebra
Collect like terms: 3x + 8y + 4x + 8y
Answer: 7x + 16y -
3. Geometry
Find the perimeter of a right triangle with sides 3cm, 4cm, 5cm
Answer: 12cm -
4. Ratio
Simplify the ratio 21:24
Answer: 7:8 -
5. Statistics
A bag has 6 red and 4 blue balls. What is the probability of picking a red ball?
Answer: 3⁄5