The order of precedence is the order in which you are going to evaluate the expressions.
1. Brackets, 2.Exponents,
3.Division and Multiplication,
4. Addition and Subtraction.
Division and multiplication have the same priority, and so do addition and subtraction.
If you have several operations of the same priority then you have to work from left to right.
The basic rule everyone should know is the BODMAS rule .
To remember the order of precedence, rememeber the BODMAS rule
B-Brackets O-Order(powers or exponents)
D-Division M-Multiplication
A- Addition S - Subtraction.