It is an accepted way so that each person who works the question out gets the same answer provided they are correct. For example, 2x4+7 could mean (2x4=8)+7=15, or it could mean 2x(4+7=11)=22 Basically, to avoid confusion.
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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.
Its only important if you want the right answer. If the wrong answer will suffice, than any order will do.
I think it is important because you need to know it when you get older.
Simple answer - people would get different answers. When it comes to Arithmetic, there is just one correct answer and that comes by following the correct order of operations :-)
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.