Keystones — Lintel
Five GCSE retrieval questions · 18 July 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000031 in standard form
Answer: 3.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 13.82cm -
4. Ratio Mixed ratio problems
Simplify: 12:4:10
Answer: 6:2:5 -
5. Statistics Mean
Calculate the mean of: 35, 7, 45, 44, 26, 45, 48, 33. Give your answer to 2 decimal places
Answer: 35.38