380709 divided by 21 
Our goal is to divide 380709 by 21.

Advancing to step 1:
When dividing 3 by 21, we get 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 21

On to step 2:
38 divided by 21 is 1 with a remainder of 17.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 21 from 38 to get 17.
Take the next digit (0) from the dividend and append it to 17, then repeat: 170 / 21

Step 3:
21 goes into 170 8 times with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
If we subtract 168 from 170, we get 2.
Append the next digit (7) from the dividend to 2 and continue with: 27 / 21

Step 4:
21 can be fit into 27 1 times, resulting in a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 181.0
If we take 21 away from 27, we end up with 6.
Bring next digit (0) of the dividend behind the 6 and repeat the process: 60 / 21

Step 5:
When dividing 60 by 21, we get 2 with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 1812.0
If we subtract 42 from 60, we get 18.
Bring next digit (9) of the dividend behind the 18 and repeat the process: 189 / 21

On to step 6:
If we divide 189 by 21, we get 9 and a remainder of 0.
The next digit of our result is 9. 
Result so far: 18129.0
If we subtract 189 from 189, we get 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 7:
21 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 18129.0
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.

Going ahead to step 8:
The number 21 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 18129.0
Subtracting 0 from 0 leaves us 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.

In conclusion, the division gives 18129.0 with a balance of 0.0.