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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Originally Posted by MSUMathStdnt 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? $\displaystyle 12+4\pmod{10}\equiv 16\pmod{10}\equiv 6\pmod{10}$

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