Keystones — Cornerstone
Five GCSE retrieval questions · 19 April 2012 · mathsvault.uk/keystones
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1. Number Adding fractions
Add: 1⁄3 + 1⁄6
Answer: 1⁄2 -
2. Algebra Two-step equations
Solve: 3x + 12 = 33
Answer: x = 7 -
3. Geometry Pythagoras — hypotenuse
Calculate the hypotenuse when a = 11cm and b = 13cm. Give your answer to 2 decimal places
Answer: 17.03cm -
4. Ratio Sharing in a ratio
Divide 70 in the ratio 3:3:1
Answer: 30, 30 and 10 -
5. Statistics Mean
Calculate the mean of: 20, 25, 37, 13, 48, 49, 37. Give your answer to 2 decimal places
Answer: 32.71