18402638 divided by 855 
We're looking to find how many times 855 goes into 18402638.

On to step 1:
1 divided by 855 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 855

Let's proceed to step 2:
If we divide 18 by 855, we get 0 and a remainder of 18.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 18 to get 18.
Grab the next digit (4) from the dividend, add it to 18, then carry on: 184 / 855

Advancing to step 3:
When dividing 184 by 855, we get 0 with a remainder of 184.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 184, we end up with 184.
Fetch the next digit (0) from the dividend, attach it to 184 and continue: 1840 / 855

On to step 4:
1840 divided by 855 is 2 with a remainder of 130.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 1710 from 1840 to get 130.
Include the next digit (2) from the dividend after 130, then repeat: 1302 / 855

Step 5:
855 goes into 1302 1 times with a remainder of 447.
The next digit of our result is 1. 
Result so far: 21.0
If we subtract 855 from 1302, we get 447.
Bring next digit (6) of the dividend behind the 447 and repeat the process: 4476 / 855

Step 6:
If we divide 4476 by 855, we get 5 and a remainder of 201.
The next digit of our result is 5. 
Result so far: 215.0
If we subtract 4275 from 4476, we get 201.
Grab the next digit (3) from the dividend, add it to 201, then carry on: 2013 / 855

Going ahead to step 7:
If we divide 2013 by 855, we get 2 and a remainder of 303.
The number 2 becomes the next digit in our result. 
Result so far: 2152.0
If we take 1710 away from 2013, we end up with 303.
Append the next digit (8) from the dividend to 303 and continue with: 3038 / 855

Going ahead to step 8:
3038 divided by 855 is 3 with a remainder of 473.
The next digit of our result is 3. 
Result so far: 21523.0
Subtract 2565 from 3038 to get 473.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4730, and continue the process.

On to step 9:
4730 divided by 855 is 5 with a remainder of 455.
Put 5 as the next digit of the answer. 
Result so far: 21523.5
If we subtract 4275 from 4730, we get 455.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4550, and continue the process.

Step 10:
If we divide 4550 by 855, we get 5 and a remainder of 275.
Use 5 as the next digit of our solution. 
Result so far: 21523.55
If we take 4275 away from 4550, we end up with 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

The quotient of the division is 21523.55, and the remainder is 0.275.