Keystones — Cornerstone
Five GCSE retrieval questions · 29 September 2025 · mathsvault.uk/keystones
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1. Number Adding fractions
Calculate: 6⁄9 + 1⁄9
Answer: 7⁄9 -
2. Algebra Two-step equations
Solve: 6x + 7 = 61
Answer: x = 9 -
3. Geometry Pythagoras — hypotenuse
Find the hypotenuse of a right triangle with sides 20cm and 21cm
Answer: 29cm -
4. Ratio Sharing in a ratio
Divide 189 in the ratio 1:2:4
Answer: 27, 54 and 108 -
5. Statistics Mean
Find the mean of: 6, 5, 16
Answer: 9