What is number theory?

[thharrimw]

what exactly is numder theory i have heard of it but i don't know what it is

 

[VeeEight]

http://en.wikipedia.org/wiki/Number_theory

Reading a book on Elementary number theory would be advisable if you are getting into advanced mathematics, or even if you are just curious about it. Modular arithmetic, the Euclidean algorithm, divisibility properties, and the Chinese remainder theorem are all good tools to use in proofs in other math courses.