Keystones — Lintel
Five GCSE retrieval questions · 10 August 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000039 in standard form
Answer: 3.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 33
Answer: (x - 3)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 38.5cm -
4. Ratio Mixed ratio problems
Black, white and yellow sweets are in the ratio 1:11:12. What fraction of the sweets are yellow?
Answer: 1⁄2 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 16, 26, 19, 50, 30, what is the missing number?
Answer: 33