Keystones — Cornerstone
Five GCSE retrieval questions · 28 February 2025 · mathsvault.uk/keystones
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1. Number Adding fractions
Add: 5⁄6 + 6⁄7
Answer: 71⁄42 -
2. Algebra Two-step equations
Solve: 7x + 9 = 86
Answer: x = 11 -
3. Geometry Pythagoras — hypotenuse
Find the hypotenuse of a right triangle with sides 9cm and 12cm
Answer: 15cm -
4. Ratio Sharing in a ratio
Share 64 in the ratio 3:1
Answer: 48 and 16 -
5. Statistics Mean
Find the mean of: 20, 17, 7, 18, 12
Answer: 14.8