Keystones — Lintel
Five GCSE retrieval questions · 11 November 2021 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 123. What are the numbers?
Answer: 40, 41, and 42 -
2. Algebra
Factorise: 4x² + 4x
Answer: 4x(x + 1) -
3. Geometry
Calculate the perimeter of a right triangle with sides 8cm and 10cm
Answer: 30.8cm -
4. Ratio
Simplify: 10:6:10
Answer: 5:3:5 -
5. Statistics
A bag has 3 red and 3 blue balls. What is the probability of picking a red ball?
Answer: 1⁄2