Keystones — Lintel
Five GCSE retrieval questions · 5 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 53,000,000 in standard form
Answer: 5.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 45
Answer: (x - 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 36.96cm -
4. Ratio Mixed ratio problems
Divide 145 in the ratio 2:2:1
Answer: 58, 58 and 29 -
5. Statistics Mean
Calculate the mean of: 43, 13, 46, 44, 21, 45, 21. Give your answer to 2 decimal places
Answer: 33.29