Keystones — Cornerstone
Five GCSE retrieval questions · 24 August 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 92 + 89
Answer: 92 + 89 = 181 -
2. Algebra
Factorise: 21x + 15
Answer: 3(7x + 5) -
3. Geometry
Opposite = 14cm, hypotenuse = 16.2cm. Find the angle
Answer: 60° (approximately) -
4. Ratio
Find 74% of 67
Answer: 49.58 -
5. Statistics
Calculate the mean of: 36, 7, 47, 32, 41, 27, 10
Answer: 28.6