Order of Operations: What does it mean?

Break it down into parts:

Order Operations

-

Who goes first in line?

of

Soooooooooo…….• The order of operations is the order in

which EACH operation is performed in an expression or equation!

5 x 13 – 10

Who goes first? Do I multiply or subtract first? Why does it matter?

Why???

• There is a certain order in which multiplication, division, addition, and subtraction must be performed when they are grouped together.

• If you do not use the proper order, your answer will be incorrect!

Just remember to excuse this lady:

Aunt Sally!

To remember which order to do each operation:

P e

M ASD

Please Excuse My Dear Aunt Sally!

P exponents

M DA S

Multiply or Divide

Parentheses

Add or Subtract

….and one more thing.

YOU MUST ALWAYS

SOLVE FROM LEFT TO

RIGHT!(EVERY TIME!)

To do this, get on the train and go in order

from left to right

following PeMDAS!

Let’s try a few examples:

Which operation would come first, second, etc…

1. 13 + 25 x 4

2. 72 ÷ 3 – 10

3. 20 x (10 – 7)

More practice time……