1. Order of Operations
By Thomas Englert

2. Goals and objectives
To understand grouping symbols and to know which number operations to perform first when solving an equation.
To understand what PEMDAS stands for.

3. PEMDAS Parentheses = ( ) Exponents = example = 23 Multiplication = ×
Division = ÷
Addition = +
Subtraction = -
There are other ways to remember the Order of Operations: BEDMAS, BEMDAS, PEDMAS, etc.

4. How to Remember PEMDAS
Please
Excuse My
Dear
Aunt
Sally

5. Parenthesis Parenthesis are brackets ( ).
Parenthesis are used to group things.
This is the first thing you do in a question.
You would also use the Order of Operations in the parenthesis. Example:
2÷(100-90×2)
2÷( )
2÷20 10

6. Exponents Exponents are the little numbers next to another number. 23
Exponents are used to shorten the equation.
If you see an exponent, you multiply the main number by itself that many times. Example:
23 = 2×2×2=8

7. Multiplication
In the Order of Operations, you would complete the equation left to right, doing which ever one appears first, Multiplication or Division.
Multiplication is adding the number a specific number of times.
The symbol for multiplication is ×. Example: 2×8=16
=16

8. Division
In the Order of Operations, you would complete the equation left to right, doing which ever one appears first, Multiplication or Division.
Division is an equation that puts numbers in to groups.
The Division symbol is ÷.
Example:
6÷2=
2|6 -6

9. Addition
In the Order of Operations, you would complete the equation left to right, doing which ever one appears first, Addition or Subtraction.
Addition is adding numbers together.
The symbol for addition is +.
Example: 6+9=15

10. Subtraction
In the Order of Operations, you would complete the equation left to right, doing which ever one appears first, Addition or Subtraction.
Subtraction is taking away a specific number.
The symbol for subtraction is -.
Example: 17-8=9

11. Practice
(2 +8) x (15 -9) =
4 + [ 6 – (7-3) ] =

12. More practice
6/ x 2 =
( 6 – 3)
2x4

13. Sample Equation
4×3+6-(12÷22+5)

14. Homework
3:01 order of operations
Page 58
Any three questions