We're dividing 20101888 by 855 
We want to figure out the number of times 20101888 can be divided by 855.

On to step 1:
2 divided by 855 is 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 855

Step 2:
855 goes into 20 0 times with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 20 to get 20.
Fetch the next digit (1) from the dividend, attach it to 20 and continue: 201 / 855

On to step 3:
855 goes into 201 0 times with a remainder of 201.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 201, we end up with 201.
Fetch the next digit (0) from the dividend, attach it to 201 and continue: 2010 / 855

Going ahead to step 4:
2010 divided by 855 is 2 with a remainder of 300.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we subtract 1710 from 2010, we get 300.
Grab the next digit (1) from the dividend, add it to 300, then carry on: 3001 / 855

Advancing to step 5:
855 can be fit into 3001 3 times, resulting in a remainder of 436.
Record the quotient 3 as the next digit in the result. 
Result so far: 23.0
The remainder is 436 after subtracting 2565 from 3001.
Take the next digit (8) from the dividend and append it to 436, then repeat: 4368 / 855

On to step 6:
When dividing 4368 by 855, we get 5 with a remainder of 93.
The next digit of our result is 5. 
Result so far: 235.0
The remainder is 93 after subtracting 4275 from 4368.
Fetch the next digit (8) from the dividend, attach it to 93 and continue: 938 / 855

Going ahead to step 7:
When dividing 938 by 855, we get 1 with a remainder of 83.
The number 1 becomes the next digit in our result. 
Result so far: 2351.0
If we take 855 away from 938, we end up with 83.
Include the next digit (8) from the dividend after 83, then repeat: 838 / 855

Going ahead to step 8:
The number 855 fits into 838 0 times, leaving a remainder of 838.
The next digit of our result is 0. 
Result so far: 23510.0
Subtracting 0 from 838 leaves us with 838.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8380, and continue the process.

Going ahead to step 9:
8380 divided by 855 is 9 with a remainder of 685.
Use 9 as the next digit of our solution. 
Result so far: 23510.9
Subtracting 7695 from 8380 leaves us with 685.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6850, and continue the process.

Going ahead to step 10:
The number 855 fits into 6850 8 times, leaving a remainder of 10.
Put 8 as the next digit of the answer. 
Result so far: 23510.98
Subtracting 6840 from 6850 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 11:
100 divided by 855 is 0 with a remainder of 100.
The number 0 becomes the next digit in our result. 
Result so far: 23510.98
Subtract 0 from 100 to get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Let's proceed to step 12:
855 goes into 1000 1 times with a remainder of 145.
Record the quotient 1 as the next digit in the result. 
Result so far: 23510.9801
The remainder is 145 after subtracting 855 from 1000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Step 13:
If we divide 1450 by 855, we get 1 and a remainder of 595.
Write down 1 as next digit of the result. 
Result so far: 23510.98011
Deduct 855 from 1450 and we're left with 595.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5950, and continue the process.

After the division, we end up with 23510.98011 and a remainder of 0.000595.