Keystones — Lintel
Five GCSE retrieval questions · 24 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.085 in standard form
Answer: 8.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 90
Answer: (x + 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 21.86cm -
4. Ratio Mixed ratio problems
Express the first part of 10:7 as a fraction in simplest form
Answer: 10⁄17 -
5. Statistics Mean
Calculate the mean of: 33, 26, 26, 39, 22, 42, 16. Give your answer to 2 decimal places
Answer: 29.14