Keystones — Lintel
Five GCSE retrieval questions · 26 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 710,000,000 in standard form
Answer: 7.1 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 17x + 66
Answer: (x - 6)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 19.48cm -
4. Ratio Mixed ratio problems
Divide 240 in the ratio 1:2:1
Answer: 60, 120 and 60 -
5. Statistics Mean
Calculate the mean of: 10, 5, 21, 44, 21, 39. Give your answer to 2 decimal places
Answer: 23.33