Keystones — Lintel
Five GCSE retrieval questions · 22 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00017 in standard form
Answer: 1.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 10
Answer: (x + 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 18.52cm -
4. Ratio Mixed ratio problems
Simplify: 6:18:18
Answer: 1:3:3 -
5. Statistics Mean
Calculate the mean of: 15, 17, 45, 19, 5, 36. Give your answer to 2 decimal places
Answer: 22.83