Let's divide 257579 by 21
We want to divide 257579 by 21.

Going ahead to step 1:
If we divide 2 by 21, we get 0 and a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 21

Let's proceed to step 2:
When dividing 25 by 21, we get 1 with a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 4 after subtracting 21 from 25.
Take the next digit (7) from the dividend and append it to 4, then repeat: 47 / 21

Advancing to step 3:
The number 21 fits into 47 2 times, leaving a remainder of 5.
Write down 2 as next digit of the result. 
Result so far: 12.0
Deduct 42 from 47 and we're left with 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 21

Moving on to step 4:
If we divide 55 by 21, we get 2 and a remainder of 13.
Record the quotient 2 as the next digit in the result. 
Result so far: 122.0
Subtracting 42 from 55 leaves us with 13.
Grab the next digit (7) from the dividend, add it to 13, then carry on: 137 / 21

Going ahead to step 5:
137 divided by 21 is 6 with a remainder of 11.
The number 6 becomes the next digit in our result. 
Result so far: 1226.0
Deduct 126 from 137 and we're left with 11.
Grab the next digit (9) from the dividend, add it to 11, then carry on: 119 / 21

Going ahead to step 6:
21 goes into 119 5 times with a remainder of 14.
Put 5 as the next digit of the answer. 
Result so far: 12265.0
If we subtract 105 from 119, we 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.

On to step 7:
140 divided by 21 is 6 with a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 12265.6
If we take 126 away from 140, 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.

Let's proceed to step 8:
If we divide 140 by 21, we get 6 and a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 12265.66
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 12265.66, and the remainder is 0.014.