I agree that math is a pretty flexible major. Though, you also have to take into account that, as a double major, you probably might end up taking only the minimum major requirements for each course. As a single major, you can go more in-depth into that major, and you probably will have more time for extracurricular activities.
You still have quite a bit of time to decide. I suggest you don't make a decision until after 1st semester sophomore year, since freshman GIRs aren't that hard IMO (their material is pretty similar to AP Calc BC, AP Physics C, etc.). For me at least, sophomore year got tougher since everybody enrolled in their major-related classes, and I was like "WOW why is everybody so BOSS all of a sudden???"
From experience, almost all freshmen want to be badass and take 7 classes a semester or something and double major and double minor. Then they get crushed. So, actually take classes first and then decide....if you haven't come to MIT yet, push these thoughts aside and wait another year to see if it's really what you want.
Last edited by happilywallowing; 08-26-2012 at 01:54 PM.
Reason: English is my only language but I type like I'm ESL