Order of operations

Khaushl and Pranav

please excuse my dear aunt Sally . WHAT IS THIS USED FOR ?

The phrase " Please excuse my dear aunt Sally " is a way to say the order of operations.

The first letters in each word of the phrase means something and what order it goes in. EX: The P in please must be done first or else you fail the question. The order is p in please first. Then the e in excuse . After that the m for my or the d for dear , which ever comes first in the expression. Finally , the a for aunt or the s for sally , which ever one comes first in the expression.

The p in please, what does it mean?

The P in the please means parenthesis that means you have to do it first : (2*8)4+8 so that means you have to do what is in the parenthesis first , and in this case you have to do 2 * 8 first.

The e in excuse , what I means ?

E in excuse means exponents. Exponents are a little number that is above a number. The number means multiply the number with it self, Ex: 5 2 pretend the 2 is small so that means it's 5*5. That is the second step of the order of operations.

The m in my and the d in dear. What do they mean ?

The m in my and the d in dear are division and multiplication. You have to do it from left to right : 8*7-18/6 so you have to do 8*7 before you do 18/6 because you have to do multiplication and division from left to right .

The A aunt and the S in Sally what do they mean?

The A in aunt and the S in Sally ,the A means add and the S means subtract. But you have do it from left to right , so if in the problem it says 8-3 before 4+3 you do 8-3 first because it was before from left to right.

Step by step


Here's a problem.

15+17 +( 42 - 8)

First subtract 42-8 because it's in parentheses. That equals 34.

Then add 15+17 because it comes before 17+34. The answer for 15+17 = 32


Then add 32 with 34. The answer is 66. That is the answer. But if you noticed the parentheses changed the entire problem if the parentheses were not there you would add 15 with 17 then add 42 and subtract 8. This is the power of parentheses!

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