Keystones — Lintel
Five GCSE retrieval questions · 26 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 72,000,000 in standard form
Answer: 7.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.18cm -
4. Ratio Mixed ratio problems
Express the second part of 10:2 as a fraction in simplest form
Answer: 1⁄6 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 21, 31, 30, what is the missing number?
Answer: 66