Keystones — Lintel
Five GCSE retrieval questions · 14 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,500,000 in standard form
Answer: 5.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 24
Answer: (x + 6)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 14.58cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 7:10:1. What fraction of the counters are yellow?
Answer: 1⁄18 -
5. Statistics Mean
Calculate the mean of: 20, 30, 5, 46, 29, 29, 16, 17
Answer: 24