Keystones — Lintel
Five GCSE retrieval questions · 28 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00047 in standard form
Answer: 4.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 40
Answer: (x + 4)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 20.65cm -
4. Ratio Mixed ratio problems
Simplify: 12:12:24
Answer: 1:1:2 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 32, 17, 44, 23, what is the missing number?
Answer: 44