We look at the division of 45603353 by 903 
Let's see how many times 903 fits into 45603353.

On to step 1:
The number 903 fits into 4 0 times, leaving a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Include the next digit (5) from the dividend after 4, then repeat: 45 / 903

Moving on to step 2:
When dividing 45 by 903, we get 0 with a remainder of 45.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 45 leaves us with 45.
Append the next digit (6) from the dividend to 45 and continue with: 456 / 903

Step 3:
If we divide 456 by 903, we get 0 and a remainder of 456.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 456 leaves us with 456.
Grab the next digit (0) from the dividend, add it to 456, then carry on: 4560 / 903

Going ahead to step 4:
4560 divided by 903 is 5 with a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Deduct 4515 from 4560 and we're left with 45.
Grab the next digit (3) from the dividend, add it to 45, then carry on: 453 / 903

Advancing to step 5:
453 divided by 903 is 0 with a remainder of 453.
Use 0 as the next digit of our solution. 
Result so far: 50.0
If we subtract 0 from 453, we get 453.
Grab the next digit (3) from the dividend, add it to 453, then carry on: 4533 / 903

On to step 6:
The number 903 fits into 4533 5 times, leaving a remainder of 18.
Use 5 as the next digit of our solution. 
Result so far: 505.0
Subtracting 4515 from 4533 leaves us with 18.
Append the next digit (5) from the dividend to 18 and continue with: 185 / 903

On to step 7:
903 goes into 185 0 times with a remainder of 185.
Use 0 as the next digit of our solution. 
Result so far: 5050.0
The remainder is 185 after subtracting 0 from 185.
Bring next digit (3) of the dividend behind the 185 and repeat the process: 1853 / 903

Going ahead to step 8:
1853 divided by 903 is 2 with a remainder of 47.
Record the quotient 2 as the next digit in the result. 
Result so far: 50502.0
Subtracting 1806 from 1853 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Going ahead to step 9:
If we divide 470 by 903, we get 0 and a remainder of 470.
The number 0 becomes the next digit in our result. 
Result so far: 50502.0
The remainder is 470 after subtracting 0 from 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Advancing to step 10:
903 goes into 4700 5 times with a remainder of 185.
The number 5 becomes the next digit in our result. 
Result so far: 50502.05
Deduct 4515 from 4700 and we're left with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

On to step 11:
When dividing 1850 by 903, we get 2 with a remainder of 44.
Record the quotient 2 as the next digit in the result. 
Result so far: 50502.052
Deduct 1806 from 1850 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 12:
903 can be fit into 440 0 times, resulting in a remainder of 440.
Record the quotient 0 as the next digit in the result. 
Result so far: 50502.052
If we subtract 0 from 440, we get 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Step 13:
4400 divided by 903 is 4 with a remainder of 788.
The number 4 becomes the next digit in our result. 
Result so far: 50502.05204
Deduct 3612 from 4400 and we're left with 788.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7880, and continue the process.

Going ahead to step 14:
The number 903 fits into 7880 8 times, leaving a remainder of 656.
Write down 8 as next digit of the result. 
Result so far: 50502.052048
Subtract 7224 from 7880 to get 656.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6560, and continue the process.

Step 15:
903 can be fit into 6560 7 times, resulting in a remainder of 239.
Put 7 as the next digit of the answer. 
Result so far: 50502.0520487
If we subtract 6321 from 6560, we get 239.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2390, and continue the process.

Going ahead to step 16:
2390 divided by 903 is 2 with a remainder of 584.
The next digit of our result is 2. 
Result so far: 50502.05204872
Deduct 1806 from 2390 and we're left with 584.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5840, and continue the process.

After the division, we end up with 50502.05204872 and a remainder of 5.84e-07.