Keystones — Cornerstone
Five GCSE retrieval questions · 20 February 2020 · mathsvault.uk/keystones
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1. Number Adding fractions
Add: 3⁄8 + 3⁄4
Answer: 9⁄8 -
2. Algebra Two-step equations
Solve: 5x - 15 = 20
Answer: x = 7 -
3. Geometry Pythagoras — hypotenuse
Calculate the hypotenuse when a = 12cm and b = 13cm
Answer: 17.69cm -
4. Ratio Sharing in a ratio
Share 36 in the ratio 2:1
Answer: 24 and 12 -
5. Statistics Mean
Find the mean of: 6, 5, 13, 11, 17
Answer: 10.4