Keystones — Lintel
Five GCSE retrieval questions · 28 May 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
200000
Answer: 2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 50°. Find adjacent side
Answer: 14.8cm -
4. Ratio Mixed ratio problems
Simplify: 20:20:12
Answer: 5:5:3 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 35, 15, 43, what is the missing number?
Answer: 27