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Math Help - Mod 5

  1. #1
    Newbie
    Joined
    Aug 2008
    From
    Butler, NJ
    Posts
    18

    Cool Mod 5

    I need to explain how positive and negative integers can be combined under the operations of addition and multiplication using mod 5. I need to give examples of how I could use this in addition using positive numbers and then negative numbers. I also need to describe how to use this in multiplication using positive and then negative numbers.

    I have read so many different materials on mod and am still having incredible difficulty figuring this out.

    Please help...
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  2. #2
    Junior Member
    Joined
    Oct 2008
    Posts
    64
    First you can make every integers including the negative one to be 0,1,2,3, or 4 modulo 5.
    For example
    since -63=-65+2=5(-13)+2, then -63=2 modulo 5.
    Then one you translate every integer into either 0,1,2,3 or 4 then addition and multiplication are basically addition and multiplication involving 0,1,2,3,4 only.
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  3. #3
    Newbie
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    Oct 2008
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    3
    Thanks for the help.
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