Keystones — Lintel
Five GCSE retrieval questions · 25 December 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00042
Answer: 4.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 60°. Find opposite
Answer: 17.3cm -
4. Ratio Mixed ratio problems
Express the first part of 3:2 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
Calculate the mean of: 28, 10, 35, 21, 6, 34, 23, 9
Answer: 20.8