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You round and double check to see if its right are not.
You can check by using your estimated number and comparing it with your exact quotient.
It is extremely important, because everyone(including me) makes simple mistakes and sometimes needs to check.
It's important to estimate before finding the real answer for any numerical problem in arithmetic or any other kind of math, so that when you think you have the real answer, you can immediately recognize whether it's total baloney or has a chance of being correct.
Accounting is important because you need to know how to budget your money properly. You also need to know how to balance your check book.