Keystones — Lintel
Five GCSE retrieval questions · 16 February 2023 · mathsvault.uk/keystones
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1. Number
Calculate: 650 + 267
Answer: 650 + 267 = 917 -
2. Algebra
Factorise: 3x² + 9x
Answer: 3x(x + 3) -
3. Geometry
Find the perimeter: hypotenuse = 23cm, one side = 18cm
Answer: 55.3cm -
4. Ratio
Calculate 41.2% of 398
Answer: 163.98 -
5. Statistics
A bag has 8 red and 8 blue balls. What is the probability of picking a red ball?
Answer: 1⁄2