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Edexcel C1 Examiners Report: 25 x 102

Discussion in 'Mathematics' started by Lee Fields, Aug 25, 2011.

  1. Lee Fields

    Lee Fields New commenter

    In the June 2011 C1 paper Question 9 (a) was:
    Calculate the sum of all the even numbers from 2 to 100 inclusive,

    2 + 4 + 6 + ...... + 100
    The Examiners' Report commented :
    "... Calculating 25 x 102 correctly, caused
    problems for many."

    So without a calculator, many A level students cannot work out 25 x 102 !
    The Educational Commissars were asleep here, putting that appalling fact in the public domain!
  2. Karvol

    Karvol Occasional commenter

    Depends how you interpret the statement. I would have interpreted it as not many students were able to figure out that the sum is "25 x 102".
    I don't teach A levels, so I could be wrong. ( I certainly hope not though! Far too scary a thought. )
  3. Maths_Mike

    Maths_Mike New commenter

    Afraid I would definitly think this means the calculation was the problem.
    the formula 0.5n(a+l) is simple enough
  4. Please sir! I know! 25 x 102 is 2550
    I can well imagine some of my students having problems with that.

  5. Nah you've got it wrong .... everyone knows (well some of my year 11 know) that the way to do it is:

    2 x 102 = 204
    5 x 102 = 610

    610 + 204 = 814

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