Keystones — Lintel
Five GCSE retrieval questions · 24 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000093 in standard form
Answer: 9.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 18.26cm -
4. Ratio Mixed ratio problems
In ratio 5:8:5, what fraction is the first part?
Answer: 5⁄18 -
5. Statistics Mean
Calculate the mean of: 21, 46, 49, 38, 45, 29, 11, 9
Answer: 31