48÷2(9+3) = ???

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EntoCraig;5043762; said:
NP. At least you are on the right track :)

Context is everything. I'm unsubscribing to this mess. Peace.

:werd:
 
2.

what is PEMDAS???? I went to school in America up to Calc 1 and never heard of it. I was taught and would do it this way:

keepinfish;5043204; said:
48 ÷ 2 (9+3)=
48 ÷ 2 (12)=
48 ÷ 2 (12)= Wouldn't the number 12 stay in parentheses? Forcing you to do 12 x 2?
48 ÷ 24=

2

its been a while...lol


svang55;5043207; said:
yea, that's what i was thinking but didn't know how to say it, you have to get rid of the ( ) first
 
2, I stopped reading 3-4 pages in, the problem being people seem to think they don't have to do () first. That is irrelevant, when a number is attached to () it is one number ex. 2(3+4)+2 everything before that +2 is one number. You can not seperate those, that would be like taking the number 4 out of the equation 4*10, and splitting it into 1 and 3 and then continueing by multiplying the 3 with the 10 and adding the 1. Which is completly incorrect, the reason you have to complete the () first is because its not in a form in which you can complete the equation until you do.
 
Order of Operations

Parenthesis
Exponents
M/D Multiply or Divide (From left to right)
A/S Add or Subtract (From left to right)

Their teaching it in a very basic form to my son in Kindergarten and my nephew in 1st grade. My niece in 4th grade is doing the same principal in introductory Algebra that I learned in 8th grade.

My sons teacher is actually teaching the phrase, Please Excuse My Dear Aunt Sally as a way to remember this. And is asking students to write this on the top of the their Math H/W before doing the assignment.

Mike
 
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