Keystones — Lintel
Five GCSE retrieval questions · 17 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 630,000 in standard form
Answer: 6.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.39cm -
4. Ratio Mixed ratio problems
Express the first part of 7:13 as a fraction in simplest form
Answer: 7⁄20 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 17, 30, 38, what is the missing number?
Answer: 67