Keystones — Lintel
Five GCSE retrieval questions · 7 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,600,000 in standard form
Answer: 6.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 70
Answer: (x + 7)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.64cm -
4. Ratio Mixed ratio problems
Simplify: 6:18:9
Answer: 2:6:3 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 34, 33, 22, 19, what is the missing number?
Answer: 27