138439 divided by 99 
We're looking to find how many times 99 goes into 138439.

Advancing to step 1:
When dividing 1 by 99, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 99

Moving on to step 2:
If we divide 13 by 99, we get 0 and a remainder of 13.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 13 after subtracting 0 from 13.
Grab the next digit (8) from the dividend, add it to 13, then carry on: 138 / 99

On to step 3:
138 divided by 99 is 1 with a remainder of 39.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 99 away from 138, we end up with 39.
Append the next digit (4) from the dividend to 39 and continue with: 394 / 99

Advancing to step 4:
When dividing 394 by 99, we get 3 with a remainder of 97.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
If we subtract 297 from 394, we get 97.
Fetch the next digit (3) from the dividend, attach it to 97 and continue: 973 / 99

Advancing to step 5:
99 goes into 973 9 times with a remainder of 82.
Write down 9 as next digit of the result. 
Result so far: 139.0
If we take 891 away from 973, we end up with 82.
Include the next digit (9) from the dividend after 82, then repeat: 829 / 99

Let's proceed to step 6:
If we divide 829 by 99, we get 8 and a remainder of 37.
Use 8 as the next digit of our solution. 
Result so far: 1398.0
If we subtract 792 from 829, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Advancing to step 7:
99 can be fit into 370 3 times, resulting in a remainder of 73.
Write down 3 as next digit of the result. 
Result so far: 1398.3
The remainder is 73 after subtracting 297 from 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

On to step 8:
If we divide 730 by 99, we get 7 and a remainder of 37.
Use 7 as the next digit of our solution. 
Result so far: 1398.37
If we take 693 away from 730, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 9:
If we divide 370 by 99, we get 3 and a remainder of 73.
The number 3 becomes the next digit in our result. 
Result so far: 1398.373
If we subtract 297 from 370, we get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Advancing to step 10:
When dividing 730 by 99, we get 7 with a remainder of 37.
The next digit of our result is 7. 
Result so far: 1398.3737
If we subtract 693 from 730, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Let's proceed to step 11:
370 divided by 99 is 3 with a remainder of 73.
Put 3 as the next digit of the answer. 
Result so far: 1398.37373
If we take 297 away from 370, we end up with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Advancing to step 12:
The number 99 fits into 730 7 times, leaving a remainder of 37.
The next digit of our result is 7. 
Result so far: 1398.373737
Subtract 693 from 730 to get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Let's proceed to step 13:
370 divided by 99 is 3 with a remainder of 73.
Use 3 as the next digit of our solution. 
Result so far: 1398.3737373
Deduct 297 from 370 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Let's proceed to step 14:
If we divide 730 by 99, we get 7 and a remainder of 37.
The number 7 becomes the next digit in our result. 
Result so far: 1398.37373737
The remainder is 37 after subtracting 693 from 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

The final outcome is 1398.37373737, with a leftover of 3.7e-08.