Keystones — Cornerstone
Five GCSE retrieval questions · 17 April 2011 · mathsvault.uk/keystones
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1. Number Adding fractions
Add: 1⁄6 + 4⁄8
Answer: 2⁄3 -
2. Algebra Two-step equations
Solve: 5x - 20 = 30
Answer: x = 10 -
3. Geometry Pythagoras — hypotenuse
Calculate the hypotenuse when a = 9cm and b = 9cm. Give your answer to 2 decimal places
Answer: 12.73cm -
4. Ratio Sharing in a ratio
Share 90 in the ratio 2:1
Answer: 60 and 30 -
5. Statistics Mean
Calculate the mean of: 41, 47, 30, 6, 5, 20. Give your answer to 2 decimal places
Answer: 24.83