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What does it mean when the markschemes say answers must be in mathematical notation and not calculator notation? What's the difference?

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Calculator notation refers to the notation that calculators sometimes use, e.g. 3^5 or 1e7.  Mathematical notation for the previous examples would be 3and 1x107.  A more in-depth list is here: http://www.webassign.net/manual/student_guide/r_s_symbolic_question_notation.htm

Generally, just don't blindly copy and paste stuff from your calculator and you should be OK.  

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