Keystones — Lintel
Five GCSE retrieval questions · 7 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00082 in standard form
Answer: 8.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 70
Answer: (x + 7)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 9cm -
4. Ratio Mixed ratio problems
In ratio 5:2:11, what fraction is the first part?
Answer: 5⁄18 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 21, 50, 39, what is the missing number?
Answer: 26