Keystones — Lintel
Five GCSE retrieval questions · 27 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 85,000,000 in standard form
Answer: 8.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 24
Answer: (x - 2)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 9.09cm -
4. Ratio Mixed ratio problems
In ratio 10:12:12, what fraction is the second part?
Answer: 6⁄17 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 18, 15, 50, what is the missing number?
Answer: 9