Keystones — Lintel
Five GCSE retrieval questions · 26 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0098 in standard form
Answer: 9.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.78cm -
4. Ratio Mixed ratio problems
Express the first part of 8:11 as a fraction in simplest form
Answer: 8⁄19 -
5. Statistics Mean
Calculate the mean of: 20, 36, 18, 34, 35, 31, 37. Give your answer to 2 decimal places
Answer: 30.14