Keystones — Lintel
Five GCSE retrieval questions · 8 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0032 in standard form
Answer: 3.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.42cm -
4. Ratio Mixed ratio problems
Divide 250 in the ratio 2:1:2
Answer: 100, 50 and 100 -
5. Statistics Mean
Calculate the mean of: 30, 11, 10, 28, 38, 44, 44. Give your answer to 2 decimal places
Answer: 29.29