Thread: 6÷2(1+2) = ? View Single Post
January 4th, 2013, 04:30 PM   #263 (permalink)
MoodyBlues
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Quote:
 Originally Posted by jhawkkw Yep, you are 100 percent correct. Under standard decimal arithmetic, that is the procedure to use. Many people learn the acronym PEMDAS, or the phrase "Please Excuse My Dear Aunt Sally", and incorrectly learn or assume that multiplication has higher precedence than division. Under standard rules of arithmetic, multiplication and division have the exact same precedence and must be computed from left to right. Addition and subtraction also have the same precedence and also should be completed from left to right.
Yes, that's exactly how I do it.

Quote:
 This is why when I teach this topic, I prefer to use the phrase "Please Exclude Mom or Dad As Sane". It gets a chuckle out of people and also inserts the idea that it's M or D, not M then D.
I like that.

I wish my dad (actually my father-in-law) was still around. He died two years ago. He was a college math professor and I'd LOVE to ask him about this.

At any rate, when I solved it, I just pictured myself back in class taking an exam, and it seemed clear as day how to solve it. But, as I said, it was actually 1982 when I was in that particular class, so maybe I was just remembering wrong.