We divide 451604 by 21
Our goal is to divide 451604 by 21.

Advancing to step 1:
4 divided by 21 is 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 21

On to step 2:
The number 21 fits into 45 2 times, leaving a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 42 from 45, we get 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 21

Going ahead to step 3:
If we divide 31 by 21, we get 1 and a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 21.0
If we subtract 21 from 31, we get 10.
Fetch the next digit (6) from the dividend, attach it to 10 and continue: 106 / 21

Going ahead to step 4:
21 goes into 106 5 times with a remainder of 1.
The next digit of our result is 5. 
Result so far: 215.0
If we take 105 away from 106, we end up with 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 21

Let's proceed to step 5:
When dividing 10 by 21, we get 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 2150.0
If we subtract 0 from 10, we get 10.
Include the next digit (4) from the dividend after 10, then repeat: 104 / 21

Moving on to step 6:
21 can be fit into 104 4 times, resulting in a remainder of 20.
Use 4 as the next digit of our solution. 
Result so far: 21504.0
If we subtract 84 from 104, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 7:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 21504.9
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 8:
If we divide 110 by 21, we get 5 and a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 21504.95
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 9:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 21504.952
If we take 42 away from 50, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 10:
80 divided by 21 is 3 with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 21504.9523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 11:
170 divided by 21 is 8 with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 21504.95238
Subtract 168 from 170 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 12:
21 goes into 20 0 times with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 21504.95238
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 13:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 21504.9523809
Subtract 189 from 200 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 14:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 21504.95238095
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final result is 21504.95238095 with a remainder of 5e-09.