Keystones — Lintel
Five GCSE retrieval questions · 27 May 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
85000000
Answer: 8.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 40°. Find adjacent side
Answer: 16.cm -
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 5 numbers is 24. If 4 of them are 49, 24, 43, 32, what is the missing number?
Answer: -28