We're dividing 31359357 by 803 
We want to divide 31359357 by 803.

Advancing to step 1:
The number 803 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 803

On to step 2:
When dividing 31 by 803, we get 0 with a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 31, we end up with 31.
Grab the next digit (3) from the dividend, add it to 31, then carry on: 313 / 803

Step 3:
803 can be fit into 313 0 times, resulting in a remainder of 313.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 313 and we're left with 313.
Bring next digit (5) of the dividend behind the 313 and repeat the process: 3135 / 803

Step 4:
803 goes into 3135 3 times with a remainder of 726.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 2409 away from 3135, we end up with 726.
Include the next digit (9) from the dividend after 726, then repeat: 7269 / 803

Moving on to step 5:
7269 divided by 803 is 9 with a remainder of 42.
Write down 9 as next digit of the result. 
Result so far: 39.0
If we subtract 7227 from 7269, we get 42.
Include the next digit (3) from the dividend after 42, then repeat: 423 / 803

Going ahead to step 6:
When dividing 423 by 803, we get 0 with a remainder of 423.
Use 0 as the next digit of our solution. 
Result so far: 390.0
Deduct 0 from 423 and we're left with 423.
Append the next digit (5) from the dividend to 423 and continue with: 4235 / 803

Moving on to step 7:
If we divide 4235 by 803, we get 5 and a remainder of 220.
The number 5 becomes the next digit in our result. 
Result so far: 3905.0
Deduct 4015 from 4235 and we're left with 220.
Grab the next digit (7) from the dividend, add it to 220, then carry on: 2207 / 803

Moving on to step 8:
When dividing 2207 by 803, we get 2 with a remainder of 601.
Write down 2 as next digit of the result. 
Result so far: 39052.0
If we subtract 1606 from 2207, we get 601.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6010, and continue the process.

On to step 9:
If we divide 6010 by 803, we get 7 and a remainder of 389.
The next digit of our result is 7. 
Result so far: 39052.7
If we subtract 5621 from 6010, we get 389.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3890, and continue the process.

Going ahead to step 10:
When dividing 3890 by 803, we get 4 with a remainder of 678.
Record the quotient 4 as the next digit in the result. 
Result so far: 39052.74
If we subtract 3212 from 3890, we get 678.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6780, and continue the process.

Going ahead to step 11:
803 goes into 6780 8 times with a remainder of 356.
Use 8 as the next digit of our solution. 
Result so far: 39052.748
Subtracting 6424 from 6780 leaves us with 356.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3560, and continue the process.

Moving on to step 12:
803 can be fit into 3560 4 times, resulting in a remainder of 348.
Write down 4 as next digit of the result. 
Result so far: 39052.7484
The remainder is 348 after subtracting 3212 from 3560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

On to step 13:
When dividing 3480 by 803, we get 4 with a remainder of 268.
Write down 4 as next digit of the result. 
Result so far: 39052.74844
If we subtract 3212 from 3480, we get 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

After the division, we end up with 39052.74844 and a remainder of 0.000268.