document.write( "Question 247184: I have a question about order of operations...
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document.write( "The problem is
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document.write( "a = 3
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document.write( "18 ÷ 2a\r
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document.write( "My question is....can the variable be separated from the number, thereby treating it like 18 ÷ 2 * 3, resulting in the answer 27,
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document.write( "or does the variable stay attached to the number 18 ÷ 2(3), resulting in the answer 3
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document.write( "Thanks,
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document.write( "Schel \n" );
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Algebra.Com's Answer #180376 by Theo(13342)![]() ![]() You can put this solution on YOUR website! a = 3 \n" ); document.write( "18 ÷ 2a\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Technically speaking you would be correct if you interpreted it as (18/2) * a because the order of arithmetic says multiplication and division are done together from left to right if parentheses don't change the natural order.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "The natural order without parentheses is:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "exponents and roots first. \n" ); document.write( "then multiplication and division. \n" ); document.write( "then addition and subtraction.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "within each level, you process left to right.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "this means if you have a multiplication followed by a division, you do the multiplication first, and if you have a division followed by a multiplication, you do the division first.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Select the following link to see one of the tutorials on the web concerning this.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "http://www.math.com/school/subject2/lessons/S2U1L2GL.html\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "I tend to think, the way it was written with the other division sign, and the way the 2 and the a were stuck together, that they meant 18 / (2*a), but that would not be technically correct if you follow the rules exactly.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "It's a matter of interpretation.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "You would not be wrong if you assumed (18/2) * a based on a strict interpretation of the rules.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "If the book shows you the answer, you can determine from that.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "If not, you can answer with an (if it is this way, then the answer is ...) and (if it is that way, then the answer is ...)\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "My gut says 18 / (2*a) but the strict interpretation of the rules says (18/2) * a.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "I can see why you're confused.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |