Transcript Review: The Order Of Operations

Review:
The Order Of Operations
Created by Katie Graves
PEMDAS
 Please
 Excuse
 My
 Dear
 Aunt
 Sally
What does PEMDAS mean?
 Please
 Parenthesis
 Excuse
 Exponents
 My
 Multiplication
 Dear
 Division
 Aunt
 Addition
 Sally
 Subtraction
This is the order we will do operations in. Whenever we are given
an equation that we need to solve, we start with the parenthesis,
and continue down the order until we hit subtraction.
How to apply PEMDAS
An easy way to remember how to use PEMDAS is to make a chart:
P
E
M
D
A
S
After doing each operation, put an X in the box if you used the
operation and a 0 in the box if you didn’t use it. With each step, go to
a new line on the chart. By doing this, you’ll be sure to remember each
of the operations. You will see a clearer example of this on the next
slide.
PEMDAS Chart
 More specifically, you can use the chart for each step:
P
E
M
D
A
2+6(3+1)2
X
2+6(4)2
X
X
2+6(16)
X
X
X
X
X
X
O
X
X
X
X
0
X
2+96
98
S
0
Please Excuse My Dear Aunt Sally!
 Let’s try some practice exercises…
 (3+1)×4
 Do the problem before moving to the next slide where you
can check your work! 
Solution
 (3+1)×4 (Parenthesis)
 (4)×4 (Multiplication)
 16
Please Excuse My Dear Aunt Sally!
 Let’s try one more…
 (9×2)÷(2+5)2+24
Solution
 (9×2)÷(2+5)2+24 (Parenthesis)
 (18)÷(2+5)2+24 (Parenthesis)
 (18)÷(7)2+24 (Exponents)
 (18)÷(49)+24 (Division)
 (18/49)+24 (Addition)
 24 18/49
Online Practice
 Go online and practice on these game websites:
 http://cemc2.math.uwaterloo.ca/mathfrog/english/kidz/o
rder.shtml
 http://www.quia.com/rr/116044.html
 Practice until you feel comfortable. Minimize this
screen so you can look back in case you have any
questions. Enjoy!