87831031 divided by 855 
We want to figure out the number of times 87831031 can be divided by 855.

On to step 1:
855 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (7) from the dividend, attach it to 8 and continue: 87 / 855

Moving on to step 2:
When dividing 87 by 855, we get 0 with a remainder of 87.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 87 leaves us with 87.
Fetch the next digit (8) from the dividend, attach it to 87 and continue: 878 / 855

Moving on to step 3:
If we divide 878 by 855, we get 1 and a remainder of 23.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 23 after subtracting 855 from 878.
Fetch the next digit (3) from the dividend, attach it to 23 and continue: 233 / 855

Advancing to step 4:
855 goes into 233 0 times with a remainder of 233.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
If we take 0 away from 233, we end up with 233.
Bring next digit (1) of the dividend behind the 233 and repeat the process: 2331 / 855

Going ahead to step 5:
When dividing 2331 by 855, we get 2 with a remainder of 621.
Write down 2 as next digit of the result. 
Result so far: 102.0
If we subtract 1710 from 2331, we get 621.
Fetch the next digit (0) from the dividend, attach it to 621 and continue: 6210 / 855

Going ahead to step 6:
855 can be fit into 6210 7 times, resulting in a remainder of 225.
The next digit of our result is 7. 
Result so far: 1027.0
If we take 5985 away from 6210, we end up with 225.
Bring next digit (3) of the dividend behind the 225 and repeat the process: 2253 / 855

Let's proceed to step 7:
The number 855 fits into 2253 2 times, leaving a remainder of 543.
Put 2 as the next digit of the answer. 
Result so far: 10272.0
The remainder is 543 after subtracting 1710 from 2253.
Append the next digit (1) from the dividend to 543 and continue with: 5431 / 855

Let's proceed to step 8:
If we divide 5431 by 855, we get 6 and a remainder of 301.
The next digit of our result is 6. 
Result so far: 102726.0
Subtract 5130 from 5431 to get 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Let's proceed to step 9:
The number 855 fits into 3010 3 times, leaving a remainder of 445.
Write down 3 as next digit of the result. 
Result so far: 102726.3
Subtract 2565 from 3010 to get 445.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4450, and continue the process.

Step 10:
855 goes into 4450 5 times with a remainder of 175.
Record the quotient 5 as the next digit in the result. 
Result so far: 102726.35
Subtracting 4275 from 4450 leaves us with 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

Moving on to step 11:
855 can be fit into 1750 2 times, resulting in a remainder of 40.
Write down 2 as next digit of the result. 
Result so far: 102726.352
If we subtract 1710 from 1750, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 12:
The number 855 fits into 400 0 times, leaving a remainder of 400.
Use 0 as the next digit of our solution. 
Result so far: 102726.352
If we subtract 0 from 400, we get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Step 13:
855 goes into 4000 4 times with a remainder of 580.
Put 4 as the next digit of the answer. 
Result so far: 102726.35204
If we subtract 3420 from 4000, we get 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Moving on to step 14:
If we divide 5800 by 855, we get 6 and a remainder of 670.
The number 6 becomes the next digit in our result. 
Result so far: 102726.352046
If we subtract 5130 from 5800, we get 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6700, and continue the process.

Going ahead to step 15:
The number 855 fits into 6700 7 times, leaving a remainder of 715.
Put 7 as the next digit of the answer. 
Result so far: 102726.3520467
The remainder is 715 after subtracting 5985 from 6700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7150, and continue the process.

Going ahead to step 16:
If we divide 7150 by 855, we get 8 and a remainder of 310.
The number 8 becomes the next digit in our result. 
Result so far: 102726.35204678
Deduct 6840 from 7150 and we're left with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

The final outcome is 102726.35204678, with a leftover of 3.1e-07.