Keystones — Cornerstone
Five GCSE retrieval questions · 24 July 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 495 + 651
Answer: 495 + 651 = 1146 -
2. Algebra
Factorise: 25x + 35
Answer: 5(5x + 7) -
3. Geometry
Find the hypotenuse of a right triangle with sides 8cm and 15cm
Answer: 17cm -
4. Ratio
Simplify: 24:20:16
Answer: 6:5:4 -
5. Statistics
Calculate the mean of: 27, 48, 27, 31, 18, 42, 27
Answer: 31.4