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E in a number

  • 01-10-2009 5:55pm
    #1
    zhangj5
    Registered Users, Registered Users 2 Posts: 36 ✭


    I always see real numbers like:
    6.336E4
    or
    1.89E-4

    What does this "E" mean?
    Thanks,


Comments

  • #2
    Pherekydes
    Registered Users, Registered Users 2 Posts: 16,202 ✭✭✭✭Pherekydes


    It means exponential notation, more commonly referred to as scientific notation.

    Reading this should help.


  • #3
    Michael Collins
    Moderators, Science, Health & Environment Moderators Posts: 1,852 Mod ✭✭✭✭Michael Collins


    Yeh you can basically replace the 'E' with the phrase "times ten to the power of".


  • #4
    zhangj5
    Registered Users, Registered Users 2 Posts: 36 ✭zhangj5


    so
    6.336E4 = 6.336 X 10000 = 63360
    and
    6.336E-4 = 6.336 x 0.0001 = 0.0006336

    are they correct?


  • #5
    Pherekydes
    Registered Users, Registered Users 2 Posts: 16,202 ✭✭✭✭Pherekydes


    zhangj5 wrote: »
    so
    6.336E4 = 6.336 X 10000 = 63360
    and
    6.336E-4 = 6.336 x 0.0001 = 0.0006336

    are they correct?

    Yes.

    If you are working with a spreadsheet you can type 6.336E4 into a cell and the spreadsheet program will recognise it as such, i.e. 63360*

    *which is the number of inches in a mile. :)


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