by 
Anonymous
ANSWERS: 4
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Because you can get different answers for the same problem when you use different orders of operations. If everyone uses the same order, then they can all arrive at the correct answer. It's very important for arithmetic to work.
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Because without it people would come up with incorrect answers.
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Its easy as heck to relly on the same flow of order without liking radical things. I wish I had more operators though, perhaps disorder makes more pure operators, but never tried that hard.
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Not all operations are commutative, so if you don't follow the correct sequence you will obtain the wrong answer. +4
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