Operator MOD

[SMcNeill]

Another simple explanation for you @bplus:

Think of what MOD is...   It's the remainder after division...  nothing more, nothing less.

INT(27 / 5) = 5
5 * 5 = 25
27 - 25 = 2
2 is the remainder.

INT(27 / -5) = -5
-5 * -5 = 25
27 - 25 = 2
2 is the remainder.

INT(-27 / 5) = -6
5 * -6 = -30
-27 - -30 = 3
3 is the answer.

It's that simple.