Keystones — Lintel
Five GCSE retrieval questions · 30 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00073 in standard form
Answer: 7.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 22
Answer: (x + 2)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 45°. Find opposite
Answer: 28cm -
4. Ratio Mixed ratio problems
Simplify the ratio £6 : 40p
Answer: 15:1 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 29, 38, 28, what is the missing number?
Answer: 65