Let's divide 13661599 by 903
Let's see how many times 903 fits into 13661599.

Step 1:
When dividing 1 by 903, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 903

Advancing to step 2:
903 can be fit into 13 0 times, resulting in a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 13 and we're left with 13.
Take the next digit (6) from the dividend and append it to 13, then repeat: 136 / 903

Going ahead to step 3:
The number 903 fits into 136 0 times, leaving a remainder of 136.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 136 leaves us with 136.
Grab the next digit (6) from the dividend, add it to 136, then carry on: 1366 / 903

Going ahead to step 4:
903 goes into 1366 1 times with a remainder of 463.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 903 from 1366 to get 463.
Take the next digit (1) from the dividend and append it to 463, then repeat: 4631 / 903

Going ahead to step 5:
The number 903 fits into 4631 5 times, leaving a remainder of 116.
Write down 5 as next digit of the result. 
Result so far: 15.0
Subtracting 4515 from 4631 leaves us with 116.
Include the next digit (5) from the dividend after 116, then repeat: 1165 / 903

Moving on to step 6:
903 goes into 1165 1 times with a remainder of 262.
Record the quotient 1 as the next digit in the result. 
Result so far: 151.0
If we take 903 away from 1165, we end up with 262.
Bring next digit (9) of the dividend behind the 262 and repeat the process: 2629 / 903

On to step 7:
If we divide 2629 by 903, we get 2 and a remainder of 823.
Record the quotient 2 as the next digit in the result. 
Result so far: 1512.0
Subtracting 1806 from 2629 leaves us with 823.
Include the next digit (9) from the dividend after 823, then repeat: 8239 / 903

Going ahead to step 8:
903 goes into 8239 9 times with a remainder of 112.
Use 9 as the next digit of our solution. 
Result so far: 15129.0
The remainder is 112 after subtracting 8127 from 8239.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Let's proceed to step 9:
If we divide 1120 by 903, we get 1 and a remainder of 217.
The next digit of our result is 1. 
Result so far: 15129.1
Deduct 903 from 1120 and we're left with 217.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2170, and continue the process.

Advancing to step 10:
The number 903 fits into 2170 2 times, leaving a remainder of 364.
Use 2 as the next digit of our solution. 
Result so far: 15129.12
Subtracting 1806 from 2170 leaves us with 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

Advancing to step 11:
3640 divided by 903 is 4 with a remainder of 28.
The next digit of our result is 4. 
Result so far: 15129.124
The remainder is 28 after subtracting 3612 from 3640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 12:
280 divided by 903 is 0 with a remainder of 280.
The number 0 becomes the next digit in our result. 
Result so far: 15129.124
If we take 0 away from 280, we end up with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

On to step 13:
903 can be fit into 2800 3 times, resulting in a remainder of 91.
The number 3 becomes the next digit in our result. 
Result so far: 15129.12403
Deduct 2709 from 2800 and we're left with 91.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

On to step 14:
903 goes into 910 1 times with a remainder of 7.
The next digit of our result is 1. 
Result so far: 15129.124031
Subtracting 903 from 910 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 15:
If we divide 70 by 903, we get 0 and a remainder of 70.
Use 0 as the next digit of our solution. 
Result so far: 15129.124031
If we subtract 0 from 70, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 16:
When dividing 700 by 903, we get 0 with a remainder of 700.
Put 0 as the next digit of the answer. 
Result so far: 15129.124031
Subtract 0 from 700 to get 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

After the division, we end up with 15129.124031 and a remainder of 7e-07.