Keystones — Lintel
Five GCSE retrieval questions · 16 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 190,000,000 in standard form
Answer: 1.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 15
Answer: (x + 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 18.16cm -
4. Ratio Mixed ratio problems
Simplify: 4:6:10
Answer: 2:3:5 -
5. Statistics Mean
Calculate the mean of: 36, 9, 22, 17, 45, 44, 27. Give your answer to 2 decimal places
Answer: 28.57