Keystones — Lintel
Five GCSE retrieval questions · 28 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 3,300,000 in standard form
Answer: 3.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 20.76cm -
4. Ratio Mixed ratio problems
In ratio 4:8:2, what fraction is the second part?
Answer: 4⁄7 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 24, 49, 32, what is the missing number?
Answer: 39