We look at the division of 21503949 by 900 
Our goal is to divide 21503949 by 900.

On to step 1:
900 can be fit into 2 0 times, resulting in a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 900

On to step 2:
21 divided by 900 is 0 with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Append the next digit (5) from the dividend to 21 and continue with: 215 / 900

Let's proceed to step 3:
900 can be fit into 215 0 times, resulting in a remainder of 215.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 215 after subtracting 0 from 215.
Include the next digit (0) from the dividend after 215, then repeat: 2150 / 900

Moving on to step 4:
900 can be fit into 2150 2 times, resulting in a remainder of 350.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 1800 from 2150 to get 350.
Append the next digit (3) from the dividend to 350 and continue with: 3503 / 900

Step 5:
When dividing 3503 by 900, we get 3 with a remainder of 803.
Record the quotient 3 as the next digit in the result. 
Result so far: 23.0
Subtracting 2700 from 3503 leaves us with 803.
Bring next digit (9) of the dividend behind the 803 and repeat the process: 8039 / 900

Step 6:
The number 900 fits into 8039 8 times, leaving a remainder of 839.
Record the quotient 8 as the next digit in the result. 
Result so far: 238.0
The remainder is 839 after subtracting 7200 from 8039.
Fetch the next digit (4) from the dividend, attach it to 839 and continue: 8394 / 900

Advancing to step 7:
The number 900 fits into 8394 9 times, leaving a remainder of 294.
Put 9 as the next digit of the answer. 
Result so far: 2389.0
Subtract 8100 from 8394 to get 294.
Take the next digit (9) from the dividend and append it to 294, then repeat: 2949 / 900

Step 8:
When dividing 2949 by 900, we get 3 with a remainder of 249.
The number 3 becomes the next digit in our result. 
Result so far: 23893.0
If we subtract 2700 from 2949, we get 249.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2490, and continue the process.

Advancing to step 9:
The number 900 fits into 2490 2 times, leaving a remainder of 690.
The next digit of our result is 2. 
Result so far: 23893.2
The remainder is 690 after subtracting 1800 from 2490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6900, and continue the process.

Going ahead to step 10:
900 goes into 6900 7 times with a remainder of 600.
The next digit of our result is 7. 
Result so far: 23893.27
If we take 6300 away from 6900, we end up with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

Moving on to step 11:
900 can be fit into 6000 6 times, resulting in a remainder of 600.
Record the quotient 6 as the next digit in the result. 
Result so far: 23893.276
Subtract 5400 from 6000 to get 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

On to step 12:
If we divide 6000 by 900, we get 6 and a remainder of 600.
The next digit of our result is 6. 
Result so far: 23893.2766
The remainder is 600 after subtracting 5400 from 6000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

After the division, we end up with 23893.2766 and a remainder of 0.006.