Keystones — Lintel
Five GCSE retrieval questions · 7 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 110,000,000 in standard form
Answer: 1.1 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 8
Answer: (x + 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 37°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.76cm -
4. Ratio Mixed ratio problems
Simplify: 18:15:12
Answer: 6:5:4 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 15, 37, 36, 26, what is the missing number?
Answer: 11