Because you may use it at your job if your a scientist or an astronaut. Basically you have to use math for every single job in the world.
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I think it is important because you need to know it when you get older.
That is important because: 1) The order in which operations are carried out can affect the result. 2) You can use parentheses to specify an order, but parentheses are often omitted for simplicity. In this case, you must know how to interpret an expression correctly.
It's not important at all, unless for some reason you want to end up with the correct answer. If you do the operations in a different order, the result will be wrong.
The order of operations is very VERY important and is a crucial piece of algebra. If you do now know the order of operations (P.E.M.D.A.S.), you will more than likely get every equation that has more than one processes in it, wrong. If you need clarification, feel free to ask :). xoxo blahitsgenaa
Its only important if you want the right answer. If the wrong answer will suffice, than any order will do.