Let's divide 342804 by 21
Let's see how many times 21 fits into 342804.

Going ahead to step 1:
When dividing 3 by 21, we get 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 21

On to step 2:
34 divided by 21 is 1 with a remainder of 13.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 21 away from 34, we end up with 13.
Include the next digit (2) from the dividend after 13, then repeat: 132 / 21

Step 3:
132 divided by 21 is 6 with a remainder of 6.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
Subtract 126 from 132 to get 6.
Fetch the next digit (8) from the dividend, attach it to 6 and continue: 68 / 21

Step 4:
68 divided by 21 is 3 with a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 163.0
Subtracting 63 from 68 leaves us with 5.
Bring next digit (0) of the dividend behind the 5 and repeat the process: 50 / 21

Advancing to step 5:
50 divided by 21 is 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 1632.0
The remainder is 8 after subtracting 42 from 50.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 21

Advancing to step 6:
21 goes into 84 4 times with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 16324.0
The remainder is 0 after subtracting 84 from 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
21 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 16324.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
21 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 16324.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 16324.0 with a remainder of 0.0.