Let's divide 139125 by 12
Our goal is to divide 139125 by 12.

On to step 1:
If we divide 1 by 12, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 12

Moving on to step 2:
When dividing 13 by 12, we get 1 with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 12 from 13 leaves us with 1.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 12

Advancing to step 3:
19 divided by 12 is 1 with a remainder of 7.
The next digit of our result is 1. 
Result so far: 11.0
Subtracting 12 from 19 leaves us with 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 12

On to step 4:
If we divide 71 by 12, we get 5 and a remainder of 11.
Put 5 as the next digit of the answer. 
Result so far: 115.0
If we take 60 away from 71, we end up with 11.
Bring next digit (2) of the dividend behind the 11 and repeat the process: 112 / 12

Going ahead to step 5:
12 goes into 112 9 times with a remainder of 4.
Record the quotient 9 as the next digit in the result. 
Result so far: 1159.0
Deduct 108 from 112 and we're left with 4.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 12

On to step 6:
45 divided by 12 is 3 with a remainder of 9.
The next digit of our result is 3. 
Result so far: 11593.0
Subtracting 36 from 45 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 7:
12 can be fit into 90 7 times, resulting in a remainder of 6.
The number 7 becomes the next digit in our result. 
Result so far: 11593.7
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 8:
12 can be fit into 60 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 11593.75
If we take 60 away from 60, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
When dividing 0 by 12, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 11593.75
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
12 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 11593.75
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 11593.75 with a remainder of 0.0.