Keystones — Lintel
Five GCSE retrieval questions · 27 March 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00094 in standard form
Answer: 9.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 36
Answer: (x + 3)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 18.91cm -
4. Ratio Mixed ratio problems
In ratio 7:1:1, what fraction is the first part?
Answer: 7⁄9 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 45, 28, 38, what is the missing number?
Answer: 13