We're dividing 128625 by 21 
Our goal is to divide 128625 by 21.

Let's proceed to step 1:
The number 21 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 21

Let's proceed to step 2:
21 goes into 12 0 times with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Include the next digit (8) from the dividend after 12, then repeat: 128 / 21

Advancing to step 3:
The number 21 fits into 128 6 times, leaving a remainder of 2.
The next digit of our result is 6. 
Result so far: 6.0
Deduct 126 from 128 and we're left with 2.
Bring next digit (6) of the dividend behind the 2 and repeat the process: 26 / 21

Advancing to step 4:
When dividing 26 by 21, we get 1 with a remainder of 5.
Record the quotient 1 as the next digit in the result. 
Result so far: 61.0
If we take 21 away from 26, we end up with 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 21

On to step 5:
52 divided by 21 is 2 with a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 612.0
Deduct 42 from 52 and we're left with 10.
Take the next digit (5) from the dividend and append it to 10, then repeat: 105 / 21

Going ahead to step 6:
21 can be fit into 105 5 times, resulting in a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 6125.0
Subtract 105 from 105 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.

Step 7:
When dividing 0 by 21, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 6125.0
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.

Advancing to step 8:
The number 21 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 6125.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 6125.0 and a remainder of 0.0.