Keystones — Cornerstone
Five GCSE retrieval questions · 20 August 2010 · mathsvault.uk/keystones
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1. Number Adding fractions
Add: 4⁄5 + 1⁄4
Answer: 21⁄20 -
2. Algebra Two-step equations
Solve: 3x + 13 = 40
Answer: x = 9 -
3. Geometry Pythagoras — hypotenuse
Find the hypotenuse of a right triangle with sides 15cm and 20cm
Answer: 25cm -
4. Ratio Sharing in a ratio
Divide 189 in the ratio 2:2:3
Answer: 54, 54 and 81 -
5. Statistics Mean
Calculate the mean of: 26, 18, 13, 24, 43, 26
Answer: 25