Keystones — Lintel
Five GCSE retrieval questions · 9 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000095 in standard form
Answer: 9.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 27
Answer: (x + 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 23.82cm -
4. Ratio Mixed ratio problems
Divide 72 in the ratio 2:1:3
Answer: 24, 12 and 36 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 31, 17, 27, what is the missing number?
Answer: 69