Keystones — Lintel
Five GCSE retrieval questions · 2 April 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0023
Answer: 2.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 30°. Find adjacent side
Answer: 16.5cm -
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 23. If 4 of them are 20, 39, 50, 19, what is the missing number?
Answer: -13