Keystones — Cornerstone
Five GCSE retrieval questions · 28 August 2025 · mathsvault.uk/keystones
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1. Number
What is 2 × 3 × 5?
Answer: 30 -
2. Algebra
Factorise: 15x + 21
Answer: 3(5x + 7) -
3. Geometry
Opposite = 20cm, adjacent = 8cm. Calculate the angle
Answer: 68.2° -
4. Ratio
Simplify: 16:16:12
Answer: 4:4:3 -
5. Statistics
A bag has 6 red and 4 blue balls. What is the probability of picking a red ball?
Answer: 3⁄5