Keystones — Lintel
Five GCSE retrieval questions · 22 October 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 999 + 509
Answer: 1508 -
2. Algebra
Solve: x⁄2 = 17
Answer: x = 34 -
3. Geometry
Opposite = 15cm, adjacent = 18cm. Calculate the angle
Answer: 39.8° -
4. Ratio
Calculate 38.3% of 841
Answer: 322.1 -
5. Statistics
A bag has 7 red and 3 blue balls. What is the probability of picking a red ball?
Answer: 7⁄10