Keystones — Cornerstone

Five GCSE retrieval questions · 6 September 2025 · mathsvault.uk/keystones

1. Number

Add: ³⁄₅ + ²⁄₄

Answer: ¹¹⁄₁₀
2. Algebra

Factorise: 30x + 18

Answer: 6(5x + 3)
3. Geometry

Find the area of a right triangle with base 7cm and height 12cm

Answer: 42cm²
4. Ratio

Simplify the ratio 35:30

Answer: 7:6
5. Statistics

Calculate the mean of: 15, 26, 40, 16, 9, 19, 19, 15

Answer: 19.9

Same five questions for everyone on Cornerstone on this date. Sets are stored as JSON for reliable print-on-demand — sign in for school-branded PDFs.