Most states and universities require that you pass a content area exam (elementary) in order to receive your teaching license.

Another route is to complete your original bachelors degree and enroll in a masters program that is for those wanting to teach. Transition to Teaching programs offer the ed courses you need while also becoming certified to teach (some people teach in a school already while doing this, depending on where they are). BEWARE – this is more expensive than changing your major now but it also ends with a masters).

Indiana University has two programs – Transition to Teaching and Community of Teachers (portfolio-based which means less ed courses and more practical teaching in order to finish your degree faster).

http://www.indiana.edu/~comteach

http://site.educ.indiana.edu/Default.aspx?tabid=4503

As for math/science, you will need some–nothing specialized. A college level math class and 1 or 2 sciences with labs are the usual requirement for any 4yr degree. I’m taking statistics and elementary physics this term; took enviromental science to fulfill the biology requirement.

Find the director of education at your school or the school you want to transfer to. He/she will be able to explain the course and practical experience you’ll need as well as get you ready for the PPST exams that are also required.

Good luck!