Keystones — Lintel
Five GCSE retrieval questions · 18 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 260,000 in standard form
Answer: 2.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 6
Answer: (x + 1)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 7.98cm -
4. Ratio Mixed ratio problems
Express the second part of 12:6 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 25, 42, 25, what is the missing number?
Answer: 68