Keystones — Lintel
Five GCSE retrieval questions · 2 July 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.085
Answer: 8.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 62°. Find adjacent side
Answer: 11.7cm -
4. Ratio Mixed ratio problems
Express the first part of 6:2 as a fraction in simplest form
Answer: 3⁄4 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 26, 38, 17, what is the missing number?
Answer: 39