Keystones — Lintel
Five GCSE retrieval questions · 12 October 2011 · 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 + 14x + 33
Answer: (x + 11)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 13.64cm -
4. Ratio Mixed ratio problems
Express the first part of 12:7 as a fraction in simplest form
Answer: 12⁄19 -
5. Statistics Mean
Calculate the mean of: 38, 39, 8, 50, 36, 36, 32. Give your answer to 2 decimal places
Answer: 34.14