Transcript Order of Operations

• ALWAYS REMEMBER TO:
• PLEASE
• EXCUSE
• MY DEAR
• AUNT SALLY
ALWAYS follow this order:
• Parentheses
• Exponent
• Multiply or Divide (from left
to right)
• Add or Subtract (from left to
right)
Let’s practice. What is the
order?
•()
•X²
•x or ÷
•+ or -
KEY CONCEPTS
1. Do every expression within the
parentheses (in order).
2. Find the value of all powers.
3. Multiply or divide in order from
left to right.
4. Add or subtract in order from
left to right.
Now, let’s look at a problem two
different ways…This will prove why
order IS important.
5+3x2
8 x 2 = 16
This is NOT correct. The
correct order of
operations has not
been followed. Let’s
do this problem
correct!
Now, let’s follow the
correct order of
operations.
5+3x2
5 + 6 = 11
Multiplication comes
before addition!
THIS IS CORRECT!
Now, let’s sing a little song sung to
the tune of “Deck the Halls”
Sung to the tune of “Deck the Halls”
Please excuse my dear Aunt Sally
This is the order of operations
Parentheses
Then the exponent
This is the order that it goes…
Multiply or Divide
Do this in order from left to right
Then you add or subtract
Do this also from left to right.
Please excuse my dear Aunt Sally
This is the order in which it goes.
Let’s practice.
(11-7) x 3 - 5
Answer: 7
Note to teacher: You can work the following problems on the board, Elmo, whiteboards,
etc. Students can even work it out on the TV screen with a dry erase marker)
6x8+4÷2
Hint: Multiply, then divide, next, add.
Answer: 50
Here’s a challenge!
96 ÷ 4² + (25 x 2) - 15 - 3
•
•
Answer: 38
•
•
•
Hints:
Solve the
parentheses
Don’t forget the
exponent
Next divide
Then add
If you have two of
the same operation
(subtraction) do
those from left to
right
Here’s one more without hints.
27 ÷ (3 + 6) x 5 - 12
Answer: 3
The most important thing to
remember is
order
order
ORDER