Keystones — Lintel
Five GCSE retrieval questions · 19 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
530000
Answer: 5.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 43°. Find adjacent side
Answer: 21.9cm -
4. Ratio Mixed ratio problems
Express the first part of 5:6 as a fraction in simplest form
Answer: 5⁄11 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 32, 47, 48, 49, 19, what is the missing number?
Answer: 27