Keystones — Cornerstone
Five GCSE retrieval questions · 1 July 2021 · mathsvault.uk/keystones
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1. Number
What is the missing number: 41 + ? = 151
Answer: 110 -
2. Algebra
Solve: 4x + 9 = 3x + 13
Answer: x = 4 -
3. Geometry
Calculate the area of a circle with diameter 22cm
Answer: 380.13cm² -
4. Ratio
Simplify: 24:20:20
Answer: 6:5:5 -
5. Statistics
Calculate the mean of: 38, 30, 24, 49, 9, 33, 45, 45
Answer: 34.1