Keystones — Lintel
Five GCSE retrieval questions · 10 October 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 46,000 in standard form
Answer: 4.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 27
Answer: (x + 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 22.38cm -
4. Ratio Mixed ratio problems
Simplify: 12:24:12
Answer: 1:2:1 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 17, 45, 44, 42, what is the missing number?
Answer: 17