Lesson - Order of Operations

**Order of Operations**

More than one operation may occur in a numerical expression. If the operations were performed in different orders, different answers would result.

For instance, consider 2 + 4 x 5. Different results could occur depending on the order of operations performed.

The **Order of Operations** is a rule that is applied to ensure that only one answer is possible for a set of operations.

Step 1 Do all operations inside parentheses.

Step 2 Simplify expressions containing exponents.

Step 3 Do multiplication and division as they occur from left to right.

Step 4 Do addition and subtraction as they occur from left to right.

The order is easier to remember if you turn it into an acronym, P E M D A S:

__P__arentheses__E__xponents__M__ultiplication__D__ivision__A__ddition__S__ubtraction

People have also made up a phrase using the first letter of each word:

"Please Excuse My Dear Aunt Sally"

Practice

**Answer Key**1.) 3

2.) 7

3.) 4

4.) 6