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.

Add + Subtract - Multiply x Divide  Please Excuse My Dear Aunt Sally P E MDMD ASAS Parentheses ( ) Exponents 4 3

Please Excuse My Dear Aunt Sally Parentheses ( ) Always do parentheses 1 st.

Please Excuse My Dear Aunt Sally Exponents 4 3 Always do Exponents 2 nd.

Multiply x Divide  Please Excuse My Dear Aunt Sally Do multiplication and division 3 rd, from left to right.

Add + Subtract - Please Excuse My Dear Aunt Sally Do addition and subtraction 4th, from left to right.

Let’s Try Some Problems!

PEMDAS (9+1)

PEMDAS 3 (9+1) (10)+6 2 3(10)

PEMDAS x x

PEMDAS x –2 x

PEMDAS 64  (9 x 3-19) 64  (27 –19) 64  8 8

Now let’s try substitution. Now let’s try substitution. Evaluate the following expressions when a = 3 and b = -2 1)4x + b 3 4(3) + (-2) 3 4(3) (3) - 8 or