Keystones — Cornerstone
Five GCSE retrieval questions · 17 October 2022 · mathsvault.uk/keystones
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1. Number
Calculate: 50 + 35
Answer: 50 + 35 = 85 -
2. Algebra
Expand: 5(2x + 8)
Answer: 10x + 40 -
3. Geometry
Find the perimeter of a right triangle with sides 3cm, 4cm, 5cm
Answer: 12cm -
4. Ratio
Simplify the ratio 15:21
Answer: 5:7 -
5. Statistics
Calculate the mean of: 47, 27, 38, 29, 26, 45, 46, 43
Answer: 37.6