We're dividing 128904 by 51 
We want to figure out the number of times 128904 can be divided by 51.

Let's proceed to step 1:
When dividing 1 by 51, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 51

Step 2:
When dividing 12 by 51, we get 0 with a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Fetch the next digit (8) from the dividend, attach it to 12 and continue: 128 / 51

Step 3:
51 goes into 128 2 times with a remainder of 26.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 102 away from 128, we end up with 26.
Append the next digit (9) from the dividend to 26 and continue with: 269 / 51

Step 4:
51 can be fit into 269 5 times, resulting in a remainder of 14.
Write down 5 as next digit of the result. 
Result so far: 25.0
If we subtract 255 from 269, we get 14.
Fetch the next digit (0) from the dividend, attach it to 14 and continue: 140 / 51

Going ahead to step 5:
140 divided by 51 is 2 with a remainder of 38.
Use 2 as the next digit of our solution. 
Result so far: 252.0
Subtract 102 from 140 to get 38.
Fetch the next digit (4) from the dividend, attach it to 38 and continue: 384 / 51

Going ahead to step 6:
51 goes into 384 7 times with a remainder of 27.
Record the quotient 7 as the next digit in the result. 
Result so far: 2527.0
The remainder is 27 after subtracting 357 from 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 7:
270 divided by 51 is 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 2527.5
Subtracting 255 from 270 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 8:
If we divide 150 by 51, we get 2 and a remainder of 48.
The number 2 becomes the next digit in our result. 
Result so far: 2527.52
If we take 102 away from 150, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 9:
The number 51 fits into 480 9 times, leaving a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 2527.529
If we take 459 away from 480, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Let's proceed to step 10:
51 goes into 210 4 times with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 2527.5294
Subtracting 204 from 210 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 11:
The number 51 fits into 60 1 times, leaving a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 2527.52941
Subtracting 51 from 60 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.

Going ahead to step 12:
51 can be fit into 90 1 times, resulting in a remainder of 39.
Write down 1 as next digit of the result. 
Result so far: 2527.529411
If we take 51 away from 90, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

The final outcome is 2527.529411, with a leftover of 3.9e-06.