Keystones — Lintel
Five GCSE retrieval questions · 5 October 2025 · mathsvault.uk/keystones
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1. Number
Find the total of 141, 168, and 138
Answer: 447 -
2. Algebra
For y = 4x³ + 13, find y when x = 3
Answer: y = 121 -
3. Geometry
Calculate the hypotenuse when a = 10cm and b = 7cm
Answer: 12.21cm -
4. Ratio
Simplify: 9:6:6
Answer: 3:2:2 -
5. Statistics
A bag has 3 red and 5 blue balls. What is the probability of picking a red ball?
Answer: 3⁄8