Keystones — Lintel
Five GCSE retrieval questions · 24 November 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0061
Answer: 6.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 50°. Find adjacent side
Answer: 25.7cm -
4. Ratio Mixed ratio problems
Express the first part of 5:2 as a fraction in simplest form
Answer: 5⁄7 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 41, 50, 26, 48, what is the missing number?
Answer: 35