I thought that was fine for something short. Well, most of these cartoons are short. I admit that I don't remember Mathman at all. I never played his games. I never even played many math games. I love how mad the kid gets.
He is stupid! To be fair, sometimes a 1 can look like a 7. You know, with the thing on top? Well, the animation probably doesn't hold up. You can draw different eyes, though.