21579 divided by 30 
Let's see how many times 30 fits into 21579.

Let's proceed to step 1:
2 divided by 30 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 30

On to step 2:
If we divide 21 by 30, we get 0 and a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Bring next digit (5) of the dividend behind the 21 and repeat the process: 215 / 30

Let's proceed to step 3:
30 goes into 215 7 times with a remainder of 5.
The next digit of our result is 7. 
Result so far: 7.0
Subtract 210 from 215 to get 5.
Append the next digit (7) from the dividend to 5 and continue with: 57 / 30

Moving on to step 4:
30 goes into 57 1 times with a remainder of 27.
The number 1 becomes the next digit in our result. 
Result so far: 71.0
If we subtract 30 from 57, we get 27.
Grab the next digit (9) from the dividend, add it to 27, then carry on: 279 / 30

Step 5:
30 goes into 279 9 times with a remainder of 9.
Write down 9 as next digit of the result. 
Result so far: 719.0
Subtract 270 from 279 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 6:
If we divide 90 by 30, we get 3 and a remainder of 0.
The next digit of our result is 3. 
Result so far: 719.3
If we subtract 90 from 90, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
0 divided by 30 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 719.3
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
If we divide 0 by 30, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 719.3
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 719.3 with a remaining 0.0.