Keystones — Lintel
Five GCSE retrieval questions · 20 August 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
340000
Answer: 3.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 35°. Find adjacent side
Answer: 22.cm -
4. Ratio Mixed ratio problems
Express the first part of 5:3 as a fraction in simplest form
Answer: 5⁄8 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 37, 22, 20, 45, what is the missing number?
Answer: 6