21025225 divided by 855 
Our goal is to divide 21025225 by 855.

On to step 1:
When dividing 2 by 855, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 855

Going ahead to step 2:
The number 855 fits into 21 0 times, leaving a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Append the next digit (0) from the dividend to 21 and continue with: 210 / 855

Step 3:
If we divide 210 by 855, we get 0 and a remainder of 210.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 210 after subtracting 0 from 210.
Fetch the next digit (2) from the dividend, attach it to 210 and continue: 2102 / 855

Let's proceed to step 4:
The number 855 fits into 2102 2 times, leaving a remainder of 392.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 1710 away from 2102, we end up with 392.
Fetch the next digit (5) from the dividend, attach it to 392 and continue: 3925 / 855

Going ahead to step 5:
855 can be fit into 3925 4 times, resulting in a remainder of 505.
Use 4 as the next digit of our solution. 
Result so far: 24.0
If we take 3420 away from 3925, we end up with 505.
Take the next digit (2) from the dividend and append it to 505, then repeat: 5052 / 855

Going ahead to step 6:
5052 divided by 855 is 5 with a remainder of 777.
Write down 5 as next digit of the result. 
Result so far: 245.0
If we take 4275 away from 5052, we end up with 777.
Grab the next digit (2) from the dividend, add it to 777, then carry on: 7772 / 855

Going ahead to step 7:
When dividing 7772 by 855, we get 9 with a remainder of 77.
The number 9 becomes the next digit in our result. 
Result so far: 2459.0
The remainder is 77 after subtracting 7695 from 7772.
Take the next digit (5) from the dividend and append it to 77, then repeat: 775 / 855

Going ahead to step 8:
The number 855 fits into 775 0 times, leaving a remainder of 775.
Put 0 as the next digit of the answer. 
Result so far: 24590.0
Subtracting 0 from 775 leaves us with 775.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7750, and continue the process.

Let's proceed to step 9:
855 can be fit into 7750 9 times, resulting in a remainder of 55.
The number 9 becomes the next digit in our result. 
Result so far: 24590.9
If we subtract 7695 from 7750, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 10:
550 divided by 855 is 0 with a remainder of 550.
Record the quotient 0 as the next digit in the result. 
Result so far: 24590.9
If we subtract 0 from 550, we get 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5500, and continue the process.

Going ahead to step 11:
The number 855 fits into 5500 6 times, leaving a remainder of 370.
The next digit of our result is 6. 
Result so far: 24590.906
If we subtract 5130 from 5500, we get 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Going ahead to step 12:
855 goes into 3700 4 times with a remainder of 280.
Put 4 as the next digit of the answer. 
Result so far: 24590.9064
Subtract 3420 from 3700 to get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Advancing to step 13:
2800 divided by 855 is 3 with a remainder of 235.
Record the quotient 3 as the next digit in the result. 
Result so far: 24590.90643
If we take 2565 away from 2800, we end up with 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Going ahead to step 14:
If we divide 2350 by 855, we get 2 and a remainder of 640.
Use 2 as the next digit of our solution. 
Result so far: 24590.906432
The remainder is 640 after subtracting 1710 from 2350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Moving on to step 15:
855 goes into 6400 7 times with a remainder of 415.
Write down 7 as next digit of the result. 
Result so far: 24590.9064327
Subtracting 5985 from 6400 leaves us with 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

On to step 16:
The number 855 fits into 4150 4 times, leaving a remainder of 730.
Record the quotient 4 as the next digit in the result. 
Result so far: 24590.90643274
Deduct 3420 from 4150 and we're left with 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7300, and continue the process.

The quotient of the division is 24590.90643274, and the remainder is 7.3e-07.