Keystones — Lintel
Five GCSE retrieval questions · 24 October 2023 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 108. What are the numbers?
Answer: 35, 36, and 37 -
2. Algebra
Factorise fully: 12x² + 15x
Answer: 3x(4x + 5) -
3. Geometry
Find perimeter: adjacent = 20cm, angle = 56°
Answer: 85.5cm -
4. Ratio
Simplify: 12:12:15
Answer: 4:4:5 -
5. Statistics
Calculate the mean of: 35, 30, 8, 36, 42, 24, 17, 20
Answer: 26.5