Keystones — Lintel
Five GCSE retrieval questions · 8 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00011 in standard form
Answer: 1.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 40
Answer: (x + 10)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 37.16cm -
4. Ratio Mixed ratio problems
Simplify: 12:20:20
Answer: 3:5:5 -
5. Statistics Mean
Calculate the mean of: 20, 38, 41, 20, 23, 17
Answer: 26.5