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4 3. Order of Operations. . ( ). +. -. X. The Order of Operations tells us how to do a math problem with more than one operation, in the correct order. P lease E xcuse M y D ear A unt S ally. This will help to you to remember the order of operations.

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43

Order of Operations

( )

+

-

X


The Order of Operations tells us how to do a math problem with more than one operation, in the correct order.


P lease e xcuse m y d ear a unt s ally
Please Excuse My Dear Aunt Sally

This will help to you to remember the order of operations.


Please excuse my dear aunt sally
Please Excuse My Dear Aunt Sally

P

Parentheses ( )

E

Exponents 43

M

D

Multiply x

Divide 

A

S

Add +

Subtract -


Please excuse my dear aunt sally1
Please Excuse My Dear Aunt Sally

Parentheses ( )

Always do parentheses 1st.


Please excuse my dear aunt sally2
Please Excuse My Dear Aunt Sally

Exponents 43

Always do Exponents 2nd.


Please excuse my dear aunt sally3
Please Excuse My Dear Aunt Sally

Multiply x

Divide 

Do multiplication and division 3rd, from left to right.


Please excuse my dear aunt sally4
Please Excuse My Dear Aunt Sally

Add +

Subtract -

Do addition and subtraction 4th, from left to right.


Let’s Try Some  Problems!


Pemdas

3+23- (9+1)

PEMDAS

3+23- 10

3+8-10

11-10

1


Pemdas1

3 (9+1) + 62

PEMDAS

3(10)+62

3(10)+36

30+36

66


Pemdas2

4+5 x (6-2)

PEMDAS

4+5 x 4

4+20

24


Pemdas3

4+ 10 x 23 -16

PEMDAS

4+10 x 8 -16

4+ 80 -16

84-16

68


Pemdas4

21 + 102 10

PEMDAS

21+10010

21 + 10

31


Pemdas5

10+72-2 x 5

PEMDAS

10+49–2 x 5

10+49- 10

59 - 10

49


Pemdas6

64  (9 x 3-19)

PEMDAS

64(27 –19)

64 8

8



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