___
12)30

To get the most the answer could be we divide the 1st digit of 12,
which is 1, into the first digit of 30 with is 3.  1 goes into 3 
3 times, so we try 3, writing it above the line above the 0.

    3
12)30

Then we multiply 3 by 12 and get 36 and write it under the 30.

    3
12)30
   36

But since 36 is larger than 30 we must erase the 3 and the 36, and
try the next smaller whole number than 3 which is 2.  So we try 2.

    2
12)30

Then we multiply 2 by 12 and get 24 and write it under the 30.

    2
12)30
   24

Now since 24 is smaller than 30 we draw a line under the 24 and
subtract getting 6, and write 6 below the line

    2
12)30
   24
    6

We have finished the division.  So now we make a fraction by putting
the bottom number 6 (called the remainder) over the number we are 
dividing by, called the divisor, 12, getting .  Then we reduce
 to  and write it after the 2 making the mixed number .  That's the answer.

Edwin