Keystones — Cornerstone
Five GCSE retrieval questions · 1 October 2021 · mathsvault.uk/keystones
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1. Number
What is the missing number: 81 + ? = 125
Answer: 44 -
2. Algebra
Expand: 6(3x + 9)
Answer: 18x + 54 -
3. Geometry
Opposite = 5cm, hypotenuse = 10cm. Find the angle
Answer: 30° (approximately) -
4. Ratio
Simplify: 8:6:8
Answer: 4:3:4 -
5. Statistics
Find the mean of: 20, 11, 2, 2, 20
Answer: 11