Keystones — Cornerstone
Five GCSE retrieval questions · 4 August 2011 · mathsvault.uk/keystones
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1. Number Adding fractions
Calculate: 1⁄5 + 3⁄5
Answer: 4⁄5 -
2. Algebra Two-step equations
Solve: 5x + 11 = 31
Answer: x = 4 -
3. Geometry Pythagoras — hypotenuse
Calculate the hypotenuse when a = 7cm and b = 5cm. Give your answer to 2 decimal places
Answer: 8.6cm -
4. Ratio Sharing in a ratio
Share 90 in the ratio 1:4
Answer: 18 and 72 -
5. Statistics Mean
Calculate the mean of: 13, 15, 37, 28, 28, 44
Answer: 27.5