Keystones — Lintel
Five GCSE retrieval questions · 30 October 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000091 in standard form
Answer: 9.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 25.93cm -
4. Ratio Mixed ratio problems
Express the second part of 12:11 as a fraction in simplest form
Answer: 11⁄23 -
5. Statistics Mean
Calculate the mean of: 45, 29, 29, 28, 9, 35, 29, 20
Answer: 28