403755 ÷ 21 
We want to divide 403755 by 21.

On to step 1:
The number 21 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 21

Advancing to step 2:
40 divided by 21 is 1 with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 21 away from 40, we end up with 19.
Append the next digit (3) from the dividend to 19 and continue with: 193 / 21

On to step 3:
The number 21 fits into 193 9 times, leaving a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
Subtracting 189 from 193 leaves us with 4.
Include the next digit (7) from the dividend after 4, then repeat: 47 / 21

Let's proceed to step 4:
21 can be fit into 47 2 times, resulting in a remainder of 5.
Use 2 as the next digit of our solution. 
Result so far: 192.0
If we take 42 away from 47, we end up with 5.
Append the next digit (5) from the dividend to 5 and continue with: 55 / 21

Moving on to step 5:
When dividing 55 by 21, we get 2 with a remainder of 13.
Use 2 as the next digit of our solution. 
Result so far: 1922.0
Subtracting 42 from 55 leaves us with 13.
Take the next digit (5) from the dividend and append it to 13, then repeat: 135 / 21

On to step 6:
21 goes into 135 6 times with a remainder of 9.
The number 6 becomes the next digit in our result. 
Result so far: 19226.0
Subtract 126 from 135 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.

Step 7:
When dividing 90 by 21, we get 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 19226.4
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.

Advancing to step 8:
21 can be fit into 60 2 times, resulting in a remainder of 18.
The next digit of our result is 2. 
Result so far: 19226.42
Subtracting 42 from 60 leaves us 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.

On to step 9:
If we divide 180 by 21, we get 8 and a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 19226.428
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 10:
120 divided by 21 is 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 19226.4285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 11:
21 goes into 150 7 times with a remainder of 3.
The next digit of our result is 7. 
Result so far: 19226.42857
Subtract 147 from 150 to 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 12:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 19226.428571
If we take 21 away from 30, we end up 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.

Advancing to step 13:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 19226.4285714
If we take 84 away from 90, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 14:
If we divide 60 by 21, we get 2 and a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 19226.42857142
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.

In conclusion, the division gives 19226.42857142 with a balance of 1.8e-08.