263324 divided by 21 
We want to figure out the number of times 263324 can be divided by 21.

Advancing 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
Subtract 0 from 2 to get 2.
Fetch the next digit (6) from the dividend, attach it to 2 and continue: 26 / 21

Going ahead 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 (3) from the dividend after 5, then repeat: 53 / 21

Going ahead to step 3:
The number 21 fits into 53 2 times, leaving a remainder of 11.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
The remainder is 11 after subtracting 42 from 53.
Include the next digit (3) from the dividend after 11, then repeat: 113 / 21

Going ahead to step 4:
21 can be fit into 113 5 times, resulting in a remainder of 8.
Record the quotient 5 as the next digit in the result. 
Result so far: 125.0
Subtracting 105 from 113 leaves us with 8.
Bring next digit (2) of the dividend behind the 8 and repeat the process: 82 / 21

On to step 5:
When dividing 82 by 21, we get 3 with a remainder of 19.
Write down 3 as next digit of the result. 
Result so far: 1253.0
If we take 63 away from 82, we end up with 19.
Fetch the next digit (4) from the dividend, attach it to 19 and continue: 194 / 21

Advancing to step 6:
If we divide 194 by 21, we get 9 and a remainder of 5.
Record the quotient 9 as the next digit in the result. 
Result so far: 12539.0
If we subtract 189 from 194, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 7:
If we divide 50 by 21, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 12539.2
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 8:
When dividing 80 by 21, we get 3 with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 12539.23
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 9:
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: 12539.238
If we subtract 168 from 170, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 10:
If we divide 20 by 21, we get 0 and a remainder of 20.
The next digit of our result is 0. 
Result so far: 12539.238
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 11:
When dividing 200 by 21, we get 9 with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 12539.23809
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 12:
21 goes into 110 5 times with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 12539.238095
Deduct 105 from 110 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 13:
50 divided by 21 is 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 12539.2380952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 14:
21 can be fit into 80 3 times, resulting in a remainder of 17.
The next digit of our result is 3. 
Result so far: 12539.23809523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

The final outcome is 12539.23809523, with a leftover of 1.7e-08.