Keystones — Lintel
Five GCSE retrieval questions · 28 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 28,000 in standard form
Answer: 2.8 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 28.99cm -
4. Ratio Mixed ratio problems
Express the first part of 12:6 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
Calculate the mean of: 24, 20, 43, 41, 5, 41
Answer: 29