51213311 ÷ 568 
We want to figure out the number of times 51213311 can be divided by 568.

Step 1:
568 goes into 5 0 times with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 568

Step 2:
568 goes into 51 0 times with a remainder of 51.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 51 leaves us with 51.
Include the next digit (2) from the dividend after 51, then repeat: 512 / 568

Going ahead to step 3:
568 can be fit into 512 0 times, resulting in a remainder of 512.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 512, we end up with 512.
Include the next digit (1) from the dividend after 512, then repeat: 5121 / 568

Let's proceed to step 4:
568 can be fit into 5121 9 times, resulting in a remainder of 9.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
If we take 5112 away from 5121, we end up with 9.
Grab the next digit (3) from the dividend, add it to 9, then carry on: 93 / 568

Step 5:
568 can be fit into 93 0 times, resulting in a remainder of 93.
Put 0 as the next digit of the answer. 
Result so far: 90.0
Subtracting 0 from 93 leaves us with 93.
Append the next digit (3) from the dividend to 93 and continue with: 933 / 568

Moving on to step 6:
The number 568 fits into 933 1 times, leaving a remainder of 365.
Write down 1 as next digit of the result. 
Result so far: 901.0
Subtract 568 from 933 to get 365.
Fetch the next digit (1) from the dividend, attach it to 365 and continue: 3651 / 568

Going ahead to step 7:
If we divide 3651 by 568, we get 6 and a remainder of 243.
The number 6 becomes the next digit in our result. 
Result so far: 9016.0
Deduct 3408 from 3651 and we're left with 243.
Take the next digit (1) from the dividend and append it to 243, then repeat: 2431 / 568

Moving on to step 8:
If we divide 2431 by 568, we get 4 and a remainder of 159.
The next digit of our result is 4. 
Result so far: 90164.0
If we subtract 2272 from 2431, we get 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

Step 9:
When dividing 1590 by 568, we get 2 with a remainder of 454.
Use 2 as the next digit of our solution. 
Result so far: 90164.2
If we subtract 1136 from 1590, we get 454.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4540, and continue the process.

Moving on to step 10:
If we divide 4540 by 568, we get 7 and a remainder of 564.
The next digit of our result is 7. 
Result so far: 90164.27
If we subtract 3976 from 4540, we get 564.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5640, and continue the process.

Advancing to step 11:
568 can be fit into 5640 9 times, resulting in a remainder of 528.
Write down 9 as next digit of the result. 
Result so far: 90164.279
Deduct 5112 from 5640 and we're left with 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Let's proceed to step 12:
568 goes into 5280 9 times with a remainder of 168.
The number 9 becomes the next digit in our result. 
Result so far: 90164.2799
The remainder is 168 after subtracting 5112 from 5280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Our division results in 90164.2799 with a remaining 0.00168.