Common PEMDAS ErrorsDate: 12/28/2001 at 12:05:31 From: Unknown Subject: PEMDAS What does PEMDAS mean? Date: 12/28/2001 at 13:56:43 From: Doctor Tim Subject: Re: PEMDAS It's a way of remembering the order of operations: Parentheses Exponents Multiplication Division Addition Subtraction Many of us are wary of such memory devices, however. I have seen many students get it wrong while reciting "PEMDAS" to themselves, for example, by failing to recognize implied multiplication, or, when they do algebra, assuming that if there is a variable, it means they "can't do it" so they move on. For example: 3 + 4x The student said, "I don't know x, so I can't do the multiplication. So I go on to addition, and that's 3 + 4, so I get 7x." - Doctor Tim, The Math Forum http://mathforum.org/dr.math/ |
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