## Definition Of Order Of Operations

Order of operation comes into play when a mathematical expression has more than one arithmetical operation.

Order of operations refers to the precedence of performing one arithmetical operation over another while working on a mathematical expression.

Here are the Rules:

1. Evaluate expressions inside parentheses.
2. Evaluate all powers
3. Perform all multiplications and/or divisions from left to right
4. Perform all additions and/or subtractions from left to right.

### More About Order of Operations

Order of operations if not rigidly followed can lead to two different solutions to the same expression.
PEMDAS - Please Excuse My Dear Aunt Sally
P - Parentheses
E - Exponents
M - Multiplication
D - Division
S - Subtraction

### Video Examples: Order Of Operations

BEDMAS
B - Brackets
E - Exponents
D - Division
M - Multiplication
S - Subtraction

### Examples of Order of Operations

2 + (25 - 4) × 20 ÷ 2
First do all operations inside parentheses
2 + (21) × 20 ÷ 2
Perform all multiplications and divisions, from left to right.
2 + 420 ÷ 2
2 + 210
Perform all additions and subtractions from left to right.
212

A. 419
B. 404
C. 409
D. 414