Keystones — Lintel
Five GCSE retrieval questions · 31 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00043 in standard form
Answer: 4.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 8
Answer: (x + 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 17.54cm -
4. Ratio Mixed ratio problems
Express the first part of 11:12 as a fraction in simplest form
Answer: 11⁄23 -
5. Statistics Mean
Calculate the mean of: 24, 35, 18, 39, 21, 49, 21. Give your answer to 2 decimal places
Answer: 29.57