The order in which you perform operations can affect the value of an expression. To avoid confusion, mathematicians have agreed on an order of operations. Multiply and divide first. Then add and subtract.order of operations.
To simplify a numerical expression, you use the order of operations and replace the expression with the simplest name for its value.
Order of Operations 1. Work inside Grouping symbols. 2. Multiply and Divide in order from left to right. 3. Add and subtract in order from left to right.