Keystones — Lintel
Five GCSE retrieval questions · 2 June 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00081 in standard form
Answer: 8.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 24
Answer: (x + 3)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 30.81cm -
4. Ratio Mixed ratio problems
Simplify: 12:6:6
Answer: 2:1:1 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 44, 33, 26, what is the missing number?
Answer: 25