Keystones — Cornerstone
Five GCSE retrieval questions · 10 June 2023 · mathsvault.uk/keystones
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1. Number
What is the missing number: 80 + ? = 166
Answer: 86 -
2. Algebra
Solve: 3x = 30
Answer: x = 10 -
3. Geometry
Calculate the area of a right triangle with perpendicular sides 9cm and 10cm
Answer: 45cm² -
4. Ratio
Simplify the ratio 24:21
Answer: 8:7 -
5. Statistics
Calculate the mean of: 9, 27, 33, 23, 7, 22, 16
Answer: 19.6