Keystones — Lintel
Five GCSE retrieval questions · 27 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 970,000,000 in standard form
Answer: 9.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 12
Answer: (x + 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.72cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 hours : 10 minutes
Answer: 30:1 -
5. Statistics Mean
Calculate the mean of: 22, 6, 41, 9, 30, 28, 20, 9. Give your answer to 2 decimal places
Answer: 20.63