Keystones — Lintel
Five GCSE retrieval questions · 5 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.023 in standard form
Answer: 2.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 72
Answer: (x + 6)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 36.37cm -
4. Ratio Mixed ratio problems
In ratio 3:10:7, what fraction is the second part?
Answer: 1⁄2 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 17, 29, 19, 40, what is the missing number?
Answer: 30