At least he is good at dat math

Yes the logic is strong in this one

is it bad that this makes perfect sense to me and is totally acceptable

Or 1 school day.

It simplifies to all. 1/1 and 4/4 is one whole. You skipped all classes today, which in this case is 4 classes.
Point is: the meaning of the whole doesn't change by using fractions. 1/1 part of a pie when the pie is 9 inch in diameter isn't less then 4/4 part of a pie with a 9 inch diameter.
You still ate the whole damn pie.

Hii can someone please tell me what's the name of this app !?

Wrong. Simplified to 1/1 outputs a percentage. So they missed 100% (1/1 or 1out of every 1) of their classes.

Maybe you should miss 3/4 and go to the math class.

Well you don't need more math, that's for sure