Keystones — Cornerstone
Five GCSE retrieval questions · 24 October 2021 · mathsvault.uk/keystones
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1. Number Adding fractions
Calculate: 2⁄5 + 1⁄5
Answer: 3⁄5 -
2. Algebra Two-step equations
Solve: 4x + 15 = 55
Answer: x = 10 -
3. Geometry Pythagoras — hypotenuse
Find the hypotenuse of a right triangle with sides 9cm and 12cm
Answer: 15cm -
4. Ratio Sharing in a ratio
Divide 154 in the ratio 2:1:4
Answer: 44, 22 and 88 -
5. Statistics Mean
Calculate the mean of: 36, 28, 23, 37, 20, 35, 42
Answer: 31.6