Keystones — Lintel
Five GCSE retrieval questions · 11 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 84,000 in standard form
Answer: 8.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 72
Answer: (x + 9)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 18.01cm -
4. Ratio Mixed ratio problems
Express the first part of 12:5 as a fraction in simplest form
Answer: 12⁄17 -
5. Statistics Mean
Calculate the mean of: 50, 29, 24, 16, 41, 14, 25, 12. Give your answer to 2 decimal places
Answer: 26.38