We look at the division of 804324 by 21 
We want to figure out the number of times 804324 can be divided by 21.

Advancing to step 1:
If we divide 8 by 21, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 21

Advancing to step 2:
If we divide 80 by 21, we get 3 and a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 63 from 80, we get 17.
Append the next digit (4) from the dividend to 17 and continue with: 174 / 21

Step 3:
21 goes into 174 8 times with a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 38.0
The remainder is 6 after subtracting 168 from 174.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 21

Let's proceed to step 4:
When dividing 63 by 21, we get 3 with a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 383.0
The remainder is 0 after subtracting 63 from 63.
Include the next digit (2) from the dividend after 0, then repeat: 2 / 21

On to step 5:
21 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 3830.0
Subtract 0 from 2 to get 2.
Include the next digit (4) from the dividend after 2, then repeat: 24 / 21

Going ahead to step 6:
24 divided by 21 is 1 with a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 38301.0
If we subtract 21 from 24, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 7:
30 divided by 21 is 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 38301.1
Subtracting 21 from 30 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 8:
21 goes into 90 4 times with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 38301.14
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 9:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 38301.142
If we take 42 away from 60, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 10:
180 divided by 21 is 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 38301.1428
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 11:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 38301.14285
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 12:
21 can be fit into 150 7 times, resulting in a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 38301.142857
Subtracting 147 from 150 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 13:
21 can be fit into 30 1 times, resulting in a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 38301.1428571
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 14:
If we divide 90 by 21, we get 4 and a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 38301.14285714
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

After the division, we end up with 38301.14285714 and a remainder of 6e-09.