Keystones — Lintel
Five GCSE retrieval questions · 26 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.073 in standard form
Answer: 7.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 55
Answer: (x + 5)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 16.74cm -
4. Ratio Mixed ratio problems
Express the first part of 3:8 as a fraction in simplest form
Answer: 3⁄11 -
5. Statistics Mean
Calculate the mean of: 13, 41, 10, 48, 26, 50, 30. Give your answer to 2 decimal places
Answer: 31.14