Keystones — Cornerstone
Five GCSE retrieval questions · 17 May 2021 · mathsvault.uk/keystones
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1. Number
What is the missing number: 72 + ? = 105
Answer: 33 -
2. Algebra
Factorise: 4x² + 4x
Answer: 4x(x + 1) -
3. Geometry
Opposite = 15cm, adjacent = 20cm. Calculate the angle
Answer: 36.9° -
4. Ratio
Simplify: 16:12:12
Answer: 4:3:3 -
5. Statistics
Calculate the mean of: 49, 8, 41, 17, 39, 38
Answer: 32