Please show me how to do long division. 
Long division is a way to divide a large number by another number with 2 or more digits.
Here is an example of a long division of a 6digit number by a 2digit number:
357481 ÷ 83
First, it is a good idea to work out the 83× table.
This is shown in the column on the right.

Multiples

We have reached the end.
The last division went exactly, so there is no remainder.
The answer is:
357481 ÷ 83 = 4307 