Keystones — Cornerstone
Five GCSE retrieval questions · 10 April 2021 · mathsvault.uk/keystones
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1. Number
What is the missing number: 93 + ? = 171
Answer: 78 -
2. Algebra
Solve: x + 12 = 30
Answer: x = 18 -
3. Geometry
Opposite = 20cm, adjacent = 18cm. Calculate the angle
Answer: 48° -
4. Ratio
Simplify: 12:8:8
Answer: 3:2:2 -
5. Statistics
Find the mean of: 20, 19, 6, 6
Answer: 12.75