Keystones — Lintel
Five GCSE retrieval questions · 4 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000067 in standard form
Answer: 6.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 22.52cm -
4. Ratio Mixed ratio problems
Express the second part of 13:3 as a fraction in simplest form
Answer: 3⁄16 -
5. Statistics Mean
Calculate the mean of: 37, 37, 12, 6, 23, 45, 15
Answer: 25