Keystones — Lintel
Five GCSE retrieval questions · 6 March 2025 · mathsvault.uk/keystones
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1. Number
Add: 1⁄5 + 2⁄4
Answer: 7⁄10 -
2. Algebra
Factorise fully: 8x² + 20x
Answer: 4x(2x + 5) -
3. Geometry
Find c if a = 11cm and b = 15cm in a right triangle
Answer: 18.6cm -
4. Ratio
Calculate 13% of 798
Answer: 103.74 -
5. Statistics
A bag has 4 red and 5 blue balls. What is the probability of picking a red ball?
Answer: 4⁄9