Keystones — Cornerstone

Five GCSE retrieval questions · 16 June 2025 · mathsvault.uk/keystones

1. Number

Simplify: x³ × x⁷

Answer: x¹⁰
2. Algebra

Solve: 9x = 81

Answer: x = 9
3. Geometry

Find the perimeter of a right triangle with sides 5cm, 12cm, 13cm

Answer: 30cm
4. Ratio

Simplify: 12:20:16

Answer: 3:5:4
5. Statistics

Calculate the mean of: 28, 30, 42, 15, 27, 45, 16, 34

Answer: 29.6

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.