When I was 16 I took 30 credits a quarter and my math GPA suffered will this effect my ability to go to grad school?
If you were officially a high school student at the time, then you may not need to submit those grades to the universities to which you apply for graduate admissions at all. In general, anything that is done before undergraduate is ignored in graduate admissions.

On the other hand, if the grades appear on your undergraduate transcript (because you applied to have the credits accepted towards graduation), then you will need to explain the situation, as keshlam suggests. Again, though, the fact that you were so young is a reasonable justification for your performance, so I wouldn't worry about it too much.