21200643 ÷ 518 
Our goal is to divide 21200643 by 518.

On to step 1:
518 goes into 2 0 times with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 518

Step 2:
If we divide 21 by 518, we get 0 and a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Append the next digit (2) from the dividend to 21 and continue with: 212 / 518

On to step 3:
The number 518 fits into 212 0 times, leaving a remainder of 212.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 212, we end up with 212.
Fetch the next digit (0) from the dividend, attach it to 212 and continue: 2120 / 518

Going ahead to step 4:
When dividing 2120 by 518, we get 4 with a remainder of 48.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtract 2072 from 2120 to get 48.
Append the next digit (0) from the dividend to 48 and continue with: 480 / 518

On to step 5:
518 can be fit into 480 0 times, resulting in a remainder of 480.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
Subtract 0 from 480 to get 480.
Fetch the next digit (6) from the dividend, attach it to 480 and continue: 4806 / 518

Advancing to step 6:
The number 518 fits into 4806 9 times, leaving a remainder of 144.
The number 9 becomes the next digit in our result. 
Result so far: 409.0
Subtracting 4662 from 4806 leaves us with 144.
Bring next digit (4) of the dividend behind the 144 and repeat the process: 1444 / 518

Moving on to step 7:
If we divide 1444 by 518, we get 2 and a remainder of 408.
The next digit of our result is 2. 
Result so far: 4092.0
Subtracting 1036 from 1444 leaves us with 408.
Grab the next digit (3) from the dividend, add it to 408, then carry on: 4083 / 518

Let's proceed to step 8:
518 goes into 4083 7 times with a remainder of 457.
The number 7 becomes the next digit in our result. 
Result so far: 40927.0
The remainder is 457 after subtracting 3626 from 4083.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4570, and continue the process.

Going ahead to step 9:
518 goes into 4570 8 times with a remainder of 426.
The number 8 becomes the next digit in our result. 
Result so far: 40927.8
The remainder is 426 after subtracting 4144 from 4570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4260, and continue the process.

Step 10:
If we divide 4260 by 518, we get 8 and a remainder of 116.
The next digit of our result is 8. 
Result so far: 40927.88
Subtract 4144 from 4260 to get 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Our division results in 40927.88 with a remaining 0.116.