558257 ÷ 21 
Our goal is to divide 558257 by 21.

Step 1:
5 divided by 21 is 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (5) from the dividend after 5, then repeat: 55 / 21

Going ahead to step 2:
21 can be fit into 55 2 times, resulting in a remainder of 13.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 13 after subtracting 42 from 55.
Fetch the next digit (8) from the dividend, attach it to 13 and continue: 138 / 21

Moving on to step 3:
If we divide 138 by 21, we get 6 and a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 26.0
If we subtract 126 from 138, we get 12.
Include the next digit (2) from the dividend after 12, then repeat: 122 / 21

On to step 4:
122 divided by 21 is 5 with a remainder of 17.
Record the quotient 5 as the next digit in the result. 
Result so far: 265.0
Subtracting 105 from 122 leaves us with 17.
Grab the next digit (5) from the dividend, add it to 17, then carry on: 175 / 21

Advancing to step 5:
21 goes into 175 8 times with a remainder of 7.
The next digit of our result is 8. 
Result so far: 2658.0
Subtract 168 from 175 to get 7.
Include the next digit (7) from the dividend after 7, then repeat: 77 / 21

Let's proceed to step 6:
21 goes into 77 3 times with a remainder of 14.
Record the quotient 3 as the next digit in the result. 
Result so far: 26583.0
If we take 63 away from 77, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 7:
When dividing 140 by 21, we get 6 with a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 26583.6
The remainder is 14 after subtracting 126 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 8:
If we divide 140 by 21, we get 6 and a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 26583.66
Subtract 126 from 140 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The quotient of the division is 26583.66, and the remainder is 0.014.