Keystones — Cornerstone
Five GCSE retrieval questions · 7 August 2026 · mathsvault.uk/keystones
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1. Number
Find the total of 160, 275, and 141
Answer: 576 -
2. Algebra
Factorise: 15x + 15
Answer: 3(5x + 5) -
3. Geometry
Opposite = 10cm, hypotenuse = 20cm. Find the angle
Answer: 30° (approximately) -
4. Ratio
Simplify the ratio 14:10
Answer: 7:5 -
5. Statistics
A bag has 8 red and 7 blue balls. What is the probability of picking a red ball?
Answer: 8⁄15