Keystones — Cornerstone
Five GCSE retrieval questions · 7 December 2014 · mathsvault.uk/keystones
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1. Number Adding fractions
Calculate: 2⁄8 + 5⁄8
Answer: 7⁄8 -
2. Algebra Two-step equations
Solve: 8x - 15 = 17
Answer: x = 4 -
3. Geometry Pythagoras — hypotenuse
Calculate the hypotenuse when a = 10cm and b = 11cm. Give your answer to 2 decimal places
Answer: 14.87cm -
4. Ratio Sharing in a ratio
Divide 125 in the ratio 3:1:1
Answer: 75, 25 and 25 -
5. Statistics Mean
Calculate the mean of: 25, 14, 43, 12, 24, 16, 11, 13
Answer: 19.75