Keystones — Lintel
Five GCSE retrieval questions · 7 May 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00054
Answer: 5.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 50°. Find adjacent side
Answer: 19.3cm -
4. Ratio Mixed ratio problems
Express the first part of 2:4 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 39, 25, 36, 39, 48, what is the missing number?
Answer: -7