Keystones — Lintel
Five GCSE retrieval questions · 23 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 41,000,000 in standard form
Answer: 4.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 46°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.06cm -
4. Ratio Mixed ratio problems
Simplify the ratio £8 : 75p
Answer: 32:3 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 39, 47, 17, 24, 48, what is the missing number?
Answer: 47