Keystones — Cornerstone
Five GCSE retrieval questions · 31 January 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 70 + 23
Answer: 70 + 23 = 93 -
2. Algebra
Factorise: 10x + 4
Answer: 2(5x + 2) -
3. Geometry
Opposite = 10cm, adjacent = 20cm. Calculate the angle
Answer: 26.6° -
4. Ratio
Find 77% of 197
Answer: 151.69 -
5. Statistics
A bag has 6 red and 6 blue balls. What is the probability of picking a red ball?
Answer: 1⁄2