Keystones — Lintel
Five GCSE retrieval questions · 8 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 78,000,000 in standard form
Answer: 7.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 70
Answer: (x + 7)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.14cm -
4. Ratio Mixed ratio problems
Simplify: 12:4:12
Answer: 3:1:3 -
5. Statistics Mean
Calculate the mean of: 50, 7, 31, 45, 5, 41, 16. Give your answer to 2 decimal places
Answer: 27.86