Keystones — Lintel
Five GCSE retrieval questions · 19 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0063 in standard form
Answer: 6.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 30
Answer: (x + 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 33.43cm -
4. Ratio Mixed ratio problems
Express the first part of 9:3 as a fraction in simplest form
Answer: 3⁄4 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 16, 43, 30, 43, 44, what is the missing number?
Answer: 58