Keystones — Lintel
Five GCSE retrieval questions · 28 September 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00015
Answer: 1.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 39°. Find adjacent side
Answer: 16.3cm -
4. Ratio Mixed ratio problems
Express the first part of 4:2 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
Calculate the mean of: 35, 10, 23, 11, 25, 33, 27
Answer: 23.4