Date: 04/08/97 at 04:40:22 From: River House Publications Subject: Mixed Operations I have been working on the following problem: 839 - 319 + 200 / 20 x 15 = The answer I first got was 540. However, I am not so sure because I cannot remember if I should have first multiplied the 20x15 before working out the rest of the sum. Could you tell me what I should have done if I was incorrect. Thank you. Mark
Date: 04/08/97 at 11:01:28 From: Doctor Mitteldorf Subject: Re: Mixed Operations Dear Mark, Whoever gave you this problem could have been clearer, it's true. But there is a rule that if they're not telling you what order to do the operations in then, you just do parentheses, exponents, multiplication-division, then addition-subtraction. So in the absence of any other instructions I'd just go from left to right, for the multiplication/division: 200 / 20 = 10 10 * 15 = 150 839 - 319 + 150 = 670 -Doctor Mitteldorf, The Math Forum Check out our web site! http://mathforum.org/dr.math/
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