Keystones — Lintel
Five GCSE retrieval questions · 27 October 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 32,000,000 in standard form
Answer: 3.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 84
Answer: (x + 7)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 22.02cm -
4. Ratio Mixed ratio problems
Simplify: 6:10:12
Answer: 3:5:6 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 17, 34, 18, 27, what is the missing number?
Answer: 44