Keystones — Lintel
Five GCSE retrieval questions · 8 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000039 in standard form
Answer: 3.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 10.94cm -
4. Ratio Mixed ratio problems
Express the second part of 13:4 as a fraction in simplest form
Answer: 4⁄17 -
5. Statistics Mean
Calculate the mean of: 7, 24, 40, 5, 48, 27, 29. Give your answer to 2 decimal places
Answer: 25.71