Keystones — Cornerstone
Five GCSE retrieval questions · 2 October 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 77 + ? = 133
Answer: 56 -
2. Algebra
Solve: 7x + 2 = 6x + 6
Answer: x = 4 -
3. Geometry
Find the hypotenuse of a right triangle with sides 8cm and 15cm
Answer: 17cm -
4. Ratio
Calculate 10% of 75
Answer: 7.5 -
5. Statistics
Calculate the mean of: 34, 24, 44, 33, 10, 22
Answer: 27.8