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Math Help - 12 plus 4 in mod 10

  1. #1
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    12 plus 4 in mod 10

    What is 12 plus 4 in mod 10? Shouldn't that be 12+4=16-10=6?
    Or even 12-10=2, 2+4=6?

    My book says "Be careful, the answer is not 6".
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by MSUMathStdnt View Post
    What is 12 plus 4 in mod 10? Shouldn't that be 12+4=16-10=6?
    Or even 12-10=2, 2+4=6?

    My book says "Be careful, the answer is not 6".
    Maybe they want you to say it this way?

    12+4\pmod{10}\equiv 16\pmod{10}\equiv 6\pmod{10}
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