We look at the division of 86310103 by 831 
We want to divide 86310103 by 831.

Advancing to step 1:
When dividing 8 by 831, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 831

Let's proceed to step 2:
The number 831 fits into 86 0 times, leaving a remainder of 86.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Grab the next digit (3) from the dividend, add it to 86, then carry on: 863 / 831

On to step 3:
863 divided by 831 is 1 with a remainder of 32.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 831 from 863 to get 32.
Include the next digit (1) from the dividend after 32, then repeat: 321 / 831

Going ahead to step 4:
When dividing 321 by 831, we get 0 with a remainder of 321.
Write down 0 as next digit of the result. 
Result so far: 10.0
Deduct 0 from 321 and we're left with 321.
Bring next digit (0) of the dividend behind the 321 and repeat the process: 3210 / 831

Moving on to step 5:
If we divide 3210 by 831, we get 3 and a remainder of 717.
Use 3 as the next digit of our solution. 
Result so far: 103.0
Deduct 2493 from 3210 and we're left with 717.
Grab the next digit (1) from the dividend, add it to 717, then carry on: 7171 / 831

Advancing to step 6:
831 can be fit into 7171 8 times, resulting in a remainder of 523.
The number 8 becomes the next digit in our result. 
Result so far: 1038.0
The remainder is 523 after subtracting 6648 from 7171.
Append the next digit (0) from the dividend to 523 and continue with: 5230 / 831

Advancing to step 7:
831 goes into 5230 6 times with a remainder of 244.
Use 6 as the next digit of our solution. 
Result so far: 10386.0
If we take 4986 away from 5230, we end up with 244.
Append the next digit (3) from the dividend to 244 and continue with: 2443 / 831

On to step 8:
831 can be fit into 2443 2 times, resulting in a remainder of 781.
Record the quotient 2 as the next digit in the result. 
Result so far: 103862.0
Deduct 1662 from 2443 and we're left with 781.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7810, and continue the process.

Step 9:
7810 divided by 831 is 9 with a remainder of 331.
Use 9 as the next digit of our solution. 
Result so far: 103862.9
Subtracting 7479 from 7810 leaves us with 331.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3310, and continue the process.

Going ahead to step 10:
3310 divided by 831 is 3 with a remainder of 817.
Write down 3 as next digit of the result. 
Result so far: 103862.93
Deduct 2493 from 3310 and we're left with 817.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8170, and continue the process.

On to step 11:
If we divide 8170 by 831, we get 9 and a remainder of 691.
Use 9 as the next digit of our solution. 
Result so far: 103862.939
Subtracting 7479 from 8170 leaves us with 691.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6910, and continue the process.

Going ahead to step 12:
If we divide 6910 by 831, we get 8 and a remainder of 262.
Write down 8 as next digit of the result. 
Result so far: 103862.9398
The remainder is 262 after subtracting 6648 from 6910.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2620, and continue the process.

Advancing to step 13:
If we divide 2620 by 831, we get 3 and a remainder of 127.
The number 3 becomes the next digit in our result. 
Result so far: 103862.93983
If we take 2493 away from 2620, we end up with 127.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Step 14:
831 goes into 1270 1 times with a remainder of 439.
Write down 1 as next digit of the result. 
Result so far: 103862.939831
If we take 831 away from 1270, we end up with 439.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4390, and continue the process.

Advancing to step 15:
831 goes into 4390 5 times with a remainder of 235.
The next digit of our result is 5. 
Result so far: 103862.9398315
Subtracting 4155 from 4390 leaves us 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.

Step 16:
When dividing 2350 by 831, we get 2 with a remainder of 688.
The number 2 becomes the next digit in our result. 
Result so far: 103862.93983152
Deduct 1662 from 2350 and we're left with 688.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6880, and continue the process.

The final result is 103862.93983152 with a remainder of 6.88e-07.