Keystones — Lintel
Five GCSE retrieval questions · 15 June 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 74,000,000 in standard form
Answer: 7.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 30
Answer: (x + 10)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.93cm -
4. Ratio Mixed ratio problems
Express the second part of 15:3 as a fraction in simplest form
Answer: 1⁄6 -
5. Statistics Mean
Calculate the mean of: 25, 12, 33, 24, 20, 37, 11. Give your answer to 2 decimal places
Answer: 23.14