In these lessons, we will learn the PEMDAS rule for the order of operations. PEMDAS is the acronym for Parenthesis, Exponents, Multiplication, Addition and Subtraction.
Related Topics: Worksheets to help you practice the PEMDAS rule.
The order to perform combined operations is called the PEMDAS rule.
Note: A common mnemonic for PEMDAS is Please Excuse My Dear Aunt Sally.
Evaluate 10 ÷ 2 + 12 ÷ 2 × 3
Using the PEMDAS rule, we need to evaluate the division and multiplication before subtraction and addition. It is recommended that you put in parenthesis to remind yourself the order of operation.
10 ÷ 2 + 12 ÷ 2 × 3
= ( 10 ÷ 2) + (12 ÷ 2 × 3)
= 5 + 18
The following videos show more examples of the application of PEMDAS.
A more complicated example for the order of operations.