Keystones — Lintel
Five GCSE retrieval questions · 3 October 2013 · 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 - 10x - 11
Answer: (x + 1)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 23.89cm -
4. Ratio Mixed ratio problems
Express the first part of 15:13 as a fraction in simplest form
Answer: 15⁄28 -
5. Statistics Mean
Calculate the mean of: 31, 39, 26, 29, 44, 16, 20. Give your answer to 2 decimal places
Answer: 29.29