Keystones — Lintel
Five GCSE retrieval questions · 14 April 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0078 in standard form
Answer: 7.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 16
Answer: (x + 2)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 16.42cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2kg : 400g
Answer: 5:1 -
5. Statistics Mean
Calculate the mean of: 30, 6, 19, 41, 18, 27
Answer: 23.5