Think about it in the United States, math education is simply horrible. Making games that assist students to get motivated about Math would be a money maker, schools would throw money at you and if it works in the browser so much the better. Make it so that it works in all browsers then you product is really flexible!
One of the ways that people who do math for a job write about it is to use LaTex, which is not what balloons are made out of.
Check it out, think that the fun factor is low for this idea and then think about how you could make it fun.
Do it now. If the United States gets much worse at Math, the citizens will have difficulty at succeeding.
(Title changed to respect the comment from Paul Topping)