The basic mathematical operators that you will use very often:
11+3 adds 3 to 11 and returns 14
17-5 subtracts 5 from 17 and returns 12
9*5 multiplies 9 by 5 and returns 45
12/3 divides 12 by 3 and returns 4
2^3 raises 2 to 3 and returns 8