Keystones — Lintel
Five GCSE retrieval questions · 11 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000086 in standard form
Answer: 8.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 50
Answer: (x + 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.24cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m : 25cm
Answer: 8:1 -
5. Statistics Mean
Calculate the mean of: 19, 31, 31, 41, 47, 8, 23, 29. Give your answer to 2 decimal places
Answer: 28.63