Keystones — Lintel
Five GCSE retrieval questions · 9 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00028
Answer: 2.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 38°. Find adjacent side
Answer: 19.7cm -
4. Ratio Mixed ratio problems
Simplify: 9:9:15
Answer: 3:3:5 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 30, 25, 46, 21, 22, what is the missing number?
Answer: 84