Keystones — Cornerstone
Five GCSE retrieval questions · 21 October 2021 · mathsvault.uk/keystones
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1. Number
Calculate: 51 + 49
Answer: 51 + 49 = 100 -
2. Algebra
Expand: 5(2x + 4)
Answer: 10x + 20 -
3. Geometry
Find the perimeter of a right triangle with sides 6cm and 8cm
Answer: 24cm -
4. Ratio
Simplify: 6:6:9
Answer: 2:2:3 -
5. Statistics
Calculate the mean of: 11, 27, 35, 5, 42, 32, 42
Answer: 27.7