Keystones — Cornerstone
Five GCSE retrieval questions · 14 December 2011 · mathsvault.uk/keystones
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1. Number Adding fractions
Calculate: 5⁄7 + 1⁄7
Answer: 6⁄7 -
2. Algebra Two-step equations
Solve: 8x - 19 = 21
Answer: x = 5 -
3. Geometry Pythagoras — hypotenuse
Calculate the hypotenuse when a = 4cm and b = 15cm. Give your answer to 2 decimal places
Answer: 15.52cm -
4. Ratio Sharing in a ratio
Divide 80 in the ratio 2:1:2
Answer: 32, 16 and 32 -
5. Statistics Mean
Find the mean of: 17, 13, 20, 6
Answer: 14