Keystones — Lintel
Five GCSE retrieval questions · 1 June 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 1⁄3 + 2⁄5 + 3⁄5
Answer: 4⁄3 -
2. Algebra
Factorise fully: 6x² + 18x
Answer: 3x(2x + 6) -
3. Geometry
Opposite = 19cm, adjacent = 17cm. Calculate the angle
Answer: 48.2° -
4. Ratio
Find 40% of 112
Answer: 44.8 -
5. Statistics
A bag has 7 red and 8 blue balls. What is the probability of picking a red ball?
Answer: 7⁄15