Keystones — Lintel
Five GCSE retrieval questions · 1 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000046 in standard form
Answer: 4.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 22x + 120
Answer: (x - 10)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 10.94cm -
4. Ratio Mixed ratio problems
In ratio 9:11:12, what fraction is the first part?
Answer: 9⁄32 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 39, 28, 50, what is the missing number?
Answer: 11