Keystones — Cornerstone
Five GCSE retrieval questions · 14 December 2015 · mathsvault.uk/keystones
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1. Number Adding fractions
Add: 2⁄3 + 1⁄4
Answer: 11⁄12 -
2. Algebra Two-step equations
Solve: 4x + 7 = 35
Answer: x = 7 -
3. Geometry Pythagoras — hypotenuse
Find the hypotenuse of a right triangle with sides 15cm and 36cm
Answer: 39cm -
4. Ratio Sharing in a ratio
Share 15 in the ratio 1:2
Answer: 5 and 10 -
5. Statistics Mean
Calculate the mean of: 38, 29, 42, 15, 46, 18, 35. Give your answer to 2 decimal places
Answer: 31.86