Keystones — Lintel
Five GCSE retrieval questions · 24 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00055 in standard form
Answer: 5.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 35.58cm -
4. Ratio Mixed ratio problems
Divide 234 in the ratio 4:1:4
Answer: 104, 26 and 104 -
5. Statistics Mean
Calculate the mean of: 9, 48, 9, 41, 40, 45
Answer: 32