Keystones — Lintel
Five GCSE retrieval questions · 9 November 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0046 in standard form
Answer: 4.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 40
Answer: (x + 4)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 23.46cm -
4. Ratio Mixed ratio problems
Divide 120 in the ratio 1:1:2
Answer: 30, 30 and 60 -
5. Statistics Mean
Calculate the mean of: 18, 31, 24, 12, 20, 50, 6
Answer: 23