Keystones — Lintel
Five GCSE retrieval questions · 20 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 850,000,000 in standard form
Answer: 8.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 40
Answer: (x + 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 19.3cm -
4. Ratio Mixed ratio problems
Divide 108 in the ratio 1:1:4
Answer: 18, 18 and 72 -
5. Statistics Mean
Calculate the mean of: 23, 40, 50, 44, 50, 6
Answer: 35.5