9%4 = 1
1%4 and the answer is 1
2%4 and the answer is 2
Answer found. - CLOSED.
The meaning of Mod is that you take the remainder after doing the division.
1 fits zero times in 4, so the remainder is 1.
Here the wikipedia definition that explains in a little more detail:
In mathematics the result of the modulo operation is the remainder of an arithmetic division. As is well known, an arithmetic division of two integers produces a quotient and a remainder.