Keystones — Lintel
Five GCSE retrieval questions · 12 April 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 3⁄4 + 1⁄5 + 1⁄2
Answer: 29⁄20 -
2. Algebra
Factorise fully: 10x² + 15x
Answer: 5x(2x + 3) -
3. Geometry
Calculate the perimeter of a right triangle with sides 7cm and 6cm
Answer: 22.2cm -
4. Ratio
Calculate 20.6% of 888
Answer: 182.93 -
5. Statistics
A bag has 8 red and 5 blue balls. What is the probability of picking a red ball?
Answer: 8⁄13