We look at the division of 264223 by 21 
We want to divide 264223 by 21.

On to step 1:
21 goes into 2 0 times with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (6) from the dividend to 2 and continue with: 26 / 21

Advancing to step 2:
If we divide 26 by 21, we get 1 and a remainder of 5.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 21 from 26, we get 5.
Include the next digit (4) from the dividend after 5, then repeat: 54 / 21

Moving on to step 3:
21 goes into 54 2 times with a remainder of 12.
The next digit of our result is 2. 
Result so far: 12.0
If we take 42 away from 54, we end up with 12.
Bring next digit (2) of the dividend behind the 12 and repeat the process: 122 / 21

Let's proceed to step 4:
21 can be fit into 122 5 times, resulting in a remainder of 17.
Record the quotient 5 as the next digit in the result. 
Result so far: 125.0
Subtract 105 from 122 to get 17.
Fetch the next digit (2) from the dividend, attach it to 17 and continue: 172 / 21

Moving on to step 5:
If we divide 172 by 21, we get 8 and a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 1258.0
If we take 168 away from 172, we end up with 4.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 21

Advancing to step 6:
If we divide 43 by 21, we get 2 and a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 12582.0
Subtract 42 from 43 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
21 goes into 10 0 times with a remainder of 10.
The next digit of our result is 0. 
Result so far: 12582.0
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
21 goes into 100 4 times with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 12582.04
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 9:
The number 21 fits into 160 7 times, leaving a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 12582.047
If we subtract 147 from 160, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 10:
If we divide 130 by 21, we get 6 and a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 12582.0476
Deduct 126 from 130 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 11:
The number 21 fits into 40 1 times, leaving a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 12582.04761
Subtracting 21 from 40 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 12:
The number 21 fits into 190 9 times, leaving a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 12582.047619
If we take 189 away from 190, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 13:
10 divided by 21 is 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 12582.047619
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 14:
21 can be fit into 100 4 times, resulting in a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 12582.04761904
Deduct 84 from 100 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The final result is 12582.04761904 with a remainder of 1.6e-08.