Keystones — Cornerstone
Five GCSE retrieval questions · 5 September 2026 · mathsvault.uk/keystones
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1. Number Adding fractions
Add: 2⁄5 + 1⁄4
Answer: 13⁄20 -
2. Algebra Two-step equations
Solve: 4x + 12 = 24
Answer: x = 3 -
3. Geometry Pythagoras — hypotenuse
Find the hypotenuse of a right triangle with sides 15cm and 20cm
Answer: 25cm -
4. Ratio Sharing in a ratio
Share 50 in the ratio 4:1
Answer: 40 and 10 -
5. Statistics Mean
Find the mean of: 5, 8, 10, 13
Answer: 9