Keystones — Cornerstone
Five GCSE retrieval questions · 7 June 2021 · mathsvault.uk/keystones
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1. Number
Calculate: 5 + (-10)
Answer: -5 -
2. Algebra
Solve: x + 6 = 12
Answer: x = 6 -
3. Geometry
Find the area of a right triangle with base 5cm and height 9cm
Answer: 22.5cm² -
4. Ratio
Simplify: 12:9:18
Answer: 4:3:6 -
5. Statistics
Calculate the mean of: 8, 19, 15, 46, 21, 19
Answer: 21.3