Keystones — Lintel
Five GCSE retrieval questions · 18 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 54,000 in standard form
Answer: 5.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 6
Answer: (x + 1)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 24.29cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 6:15. What fraction of the counters are blue?
Answer: 5⁄7 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 47, 47, 20, what is the missing number?
Answer: 14