Keystones — Lintel
Five GCSE retrieval questions · 4 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000036 in standard form
Answer: 3.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 13.77cm -
4. Ratio Mixed ratio problems
In ratio 2:8:5, what fraction is the first part?
Answer: 2⁄15 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 30, 33, 30, what is the missing number?
Answer: 35