We look at the division of 129638 by 12 
We want to figure out the number of times 129638 can be divided by 12.

Step 1:
1 divided by 12 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 12

Advancing to step 2:
When dividing 12 by 12, we get 1 with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 12 from 12 leaves us with 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 12

Step 3:
12 can be fit into 9 0 times, resulting in a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtract 0 from 9 to get 9.
Fetch the next digit (6) from the dividend, attach it to 9 and continue: 96 / 12

Moving on to step 4:
The number 12 fits into 96 8 times, leaving a remainder of 0.
The next digit of our result is 8. 
Result so far: 108.0
Subtracting 96 from 96 leaves us with 0.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 12

Moving on to step 5:
When dividing 3 by 12, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 1080.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 12

Moving on to step 6:
When dividing 38 by 12, we get 3 with a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 10803.0
Subtract 36 from 38 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 7:
When dividing 20 by 12, we get 1 with a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 10803.1
If we subtract 12 from 20, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 8:
When dividing 80 by 12, we get 6 with a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 10803.16
If we take 72 away from 80, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 9:
12 goes into 80 6 times with a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 10803.166
If we subtract 72 from 80, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final result is 10803.166 with a remainder of 0.0008.