We look at the division of 268582 by 21 
Let's see how many times 21 fits into 268582.

Step 1:
2 divided by 21 is 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 2, we 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.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 21 from 26, we get 5.
Take the next digit (8) from the dividend and append it to 5, then repeat: 58 / 21

Let's proceed to step 3:
21 goes into 58 2 times with a remainder of 16.
The next digit of our result is 2. 
Result so far: 12.0
If we take 42 away from 58, we end up with 16.
Append the next digit (5) from the dividend to 16 and continue with: 165 / 21

Advancing to step 4:
The number 21 fits into 165 7 times, leaving a remainder of 18.
Write down 7 as next digit of the result. 
Result so far: 127.0
Subtract 147 from 165 to get 18.
Bring next digit (8) of the dividend behind the 18 and repeat the process: 188 / 21

Let's proceed to step 5:
188 divided by 21 is 8 with a remainder of 20.
Put 8 as the next digit of the answer. 
Result so far: 1278.0
Subtracting 168 from 188 leaves us with 20.
Grab the next digit (2) from the dividend, add it to 20, then carry on: 202 / 21

Going ahead to step 6:
21 goes into 202 9 times with a remainder of 13.
Record the quotient 9 as the next digit in the result. 
Result so far: 12789.0
The remainder is 13 after subtracting 189 from 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 7:
The number 21 fits into 130 6 times, leaving a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 12789.6
The remainder is 4 after subtracting 126 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 8:
21 can be fit into 40 1 times, resulting in a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 12789.61
Subtract 21 from 40 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 9:
21 can be fit into 190 9 times, resulting in a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 12789.619
Deduct 189 from 190 and we're left 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.

Step 10:
21 goes into 10 0 times with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 12789.619
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.

Going ahead to step 11:
The number 21 fits into 100 4 times, leaving a remainder of 16.
The next digit of our result is 4. 
Result so far: 12789.61904
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.

Going ahead to step 12:
21 can be fit into 160 7 times, resulting in a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 12789.619047
Subtracting 147 from 160 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 13:
When dividing 130 by 21, we get 6 with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 12789.6190476
The remainder is 4 after subtracting 126 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 14:
If we divide 40 by 21, we get 1 and a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 12789.61904761
Subtract 21 from 40 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

The final outcome is 12789.61904761, with a leftover of 1.9e-08.