Keystones — Lintel
Five GCSE retrieval questions · 14 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 150,000,000 in standard form
Answer: 1.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x + 12
Answer: (x + 4)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 17.53cm -
4. Ratio Mixed ratio problems
In ratio 4:1:12, what fraction is the second part?
Answer: 1⁄17 -
5. Statistics Mean
Calculate the mean of: 21, 38, 21, 24, 16, 36
Answer: 26