Keystones — Cornerstone
Five GCSE retrieval questions · 25 January 2025 · mathsvault.uk/keystones
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1. Number Adding fractions
Add: 2⁄8 + 1⁄4
Answer: 1⁄2 -
2. Algebra Two-step equations
Solve: 7x - 20 = 50
Answer: x = 10 -
3. Geometry Pythagoras — hypotenuse
Calculate the hypotenuse when a = 3cm and b = 6cm
Answer: 6.71cm -
4. Ratio Sharing in a ratio
Divide 154 in the ratio 1:3:3
Answer: 22, 66 and 66 -
5. Statistics Mean
Calculate the mean of: 5, 30, 43, 39, 5, 16, 27
Answer: 23.6