Keystones — Cornerstone
Five GCSE retrieval questions · 18 December 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 79 + 57
Answer: 79 + 57 = 136 -
2. Algebra
Expand: 4(4x + 6)
Answer: 16x + 24 -
3. Geometry
Calculate the area of a circle with diameter 8cm
Answer: 50.27cm² -
4. Ratio
Simplify the ratio 15:18
Answer: 5:6 -
5. Statistics
A bag has 8 red and 8 blue balls. What is the probability of picking a red ball?
Answer: 1⁄2