Keystones — Lintel
Five GCSE retrieval questions · 22 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 55,000,000 in standard form
Answer: 5.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 14.28cm -
4. Ratio Mixed ratio problems
Simplify: 6:12:15
Answer: 2:4:5 -
5. Statistics Mean
Calculate the mean of: 6, 29, 32, 10, 8, 7, 26, 42
Answer: 20