Keystones — Lintel
Five GCSE retrieval questions · 7 June 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
4100000
Answer: 4.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 27°. Find adjacent side
Answer: 20.5cm -
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 6 numbers is 27. If 5 of them are 41, 37, 47, 46, 23, what is the missing number?
Answer: -32