Keystones — Lintel
Five GCSE retrieval questions · 14 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 92,000,000 in standard form
Answer: 9.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 20
Answer: (x + 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 9.09cm -
4. Ratio Mixed ratio problems
Simplify the ratio £8 : 90p
Answer: 80:9 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 32, 43, 27, what is the missing number?
Answer: 22