Keystones — Lintel
Five GCSE retrieval questions · 4 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,800,000 in standard form
Answer: 9.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 10
Answer: (x + 1)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 20.31cm -
4. Ratio Mixed ratio problems
Simplify: 15:18:9
Answer: 5:6:3 -
5. Statistics Mean
Calculate the mean of: 47, 8, 7, 26, 25, 49, 23, 19
Answer: 25.5