All around bad
The hit detection is atrocious. Also, for no reason whatsoever the game will knock me down from time to time even though no obstacle is present. I think the "math" element of this is pretty downplayed as well.
Author Comments
Pick a boy or girl skater.
Choose your skater math arithmetic subject.
You can use your mouse or the number keys to answer the skater math questions.
Make sure you don't press the correct answer until your skater is ready to jump over the obstruction.
You have 3 guys to go as far as you can in skater math.
Are you the top skater math skateboarder?
Delay
Seems really good, but I think the delay between when I press the button and when I jump ruins it. It seems like this delay is meant to be there, but I think you should remove it cause with this, the only difficulty is to press the button at the right time to jump over the obstruction, not to make maths.