We look at the division of 345555 by 21 
Our goal is to divide 345555 by 21.

Step 1:
21 goes into 3 0 times with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Include the next digit (4) from the dividend after 3, then repeat: 34 / 21

Moving on to step 2:
If we divide 34 by 21, we get 1 and a remainder of 13.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 21 from 34, we get 13.
Include the next digit (5) from the dividend after 13, then repeat: 135 / 21

Advancing to step 3:
The number 21 fits into 135 6 times, leaving a remainder of 9.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
Deduct 126 from 135 and we're left with 9.
Bring next digit (5) of the dividend behind the 9 and repeat the process: 95 / 21

Advancing to step 4:
21 goes into 95 4 times with a remainder of 11.
Put 4 as the next digit of the answer. 
Result so far: 164.0
The remainder is 11 after subtracting 84 from 95.
Bring next digit (5) of the dividend behind the 11 and repeat the process: 115 / 21

Step 5:
When dividing 115 by 21, we get 5 with a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 1645.0
If we take 105 away from 115, we end up with 10.
Include the next digit (5) from the dividend after 10, then repeat: 105 / 21

Moving on to step 6:
21 can be fit into 105 5 times, resulting in a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 16455.0
Subtract 105 from 105 to 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.

Going ahead to step 7:
If we divide 0 by 21, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 16455.0
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.

Moving on to step 8:
0 divided by 21 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 16455.0
The remainder is 0 after subtracting 0 from 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 16455.0 with a balance of 0.0.