81811390 ÷ 668 
Let's see how many times 668 fits into 81811390.

On to step 1:
668 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 668

Step 2:
81 divided by 668 is 0 with a remainder of 81.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Grab the next digit (8) from the dividend, add it to 81, then carry on: 818 / 668

Let's proceed to step 3:
668 goes into 818 1 times with a remainder of 150.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 668 from 818 leaves us with 150.
Grab the next digit (1) from the dividend, add it to 150, then carry on: 1501 / 668

On to step 4:
668 can be fit into 1501 2 times, resulting in a remainder of 165.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Deduct 1336 from 1501 and we're left with 165.
Take the next digit (1) from the dividend and append it to 165, then repeat: 1651 / 668

Going ahead to step 5:
668 can be fit into 1651 2 times, resulting in a remainder of 315.
Put 2 as the next digit of the answer. 
Result so far: 122.0
If we subtract 1336 from 1651, we get 315.
Include the next digit (3) from the dividend after 315, then repeat: 3153 / 668

Going ahead to step 6:
If we divide 3153 by 668, we get 4 and a remainder of 481.
Use 4 as the next digit of our solution. 
Result so far: 1224.0
If we subtract 2672 from 3153, we get 481.
Include the next digit (9) from the dividend after 481, then repeat: 4819 / 668

Let's proceed to step 7:
668 can be fit into 4819 7 times, resulting in a remainder of 143.
Put 7 as the next digit of the answer. 
Result so far: 12247.0
Subtract 4676 from 4819 to get 143.
Bring next digit (0) of the dividend behind the 143 and repeat the process: 1430 / 668

Moving on to step 8:
The number 668 fits into 1430 2 times, leaving a remainder of 94.
Use 2 as the next digit of our solution. 
Result so far: 122472.0
Subtract 1336 from 1430 to get 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Going ahead to step 9:
When dividing 940 by 668, we get 1 with a remainder of 272.
Write down 1 as next digit of the result. 
Result so far: 122472.1
The remainder is 272 after subtracting 668 from 940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Advancing to step 10:
When dividing 2720 by 668, we get 4 with a remainder of 48.
The number 4 becomes the next digit in our result. 
Result so far: 122472.14
If we subtract 2672 from 2720, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 11:
480 divided by 668 is 0 with a remainder of 480.
Record the quotient 0 as the next digit in the result. 
Result so far: 122472.14
Subtracting 0 from 480 leaves us with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Moving on to step 12:
668 goes into 4800 7 times with a remainder of 124.
Put 7 as the next digit of the answer. 
Result so far: 122472.1407
If we subtract 4676 from 4800, we get 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

On to step 13:
If we divide 1240 by 668, we get 1 and a remainder of 572.
Use 1 as the next digit of our solution. 
Result so far: 122472.14071
If we take 668 away from 1240, we end up with 572.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5720, and continue the process.

Going ahead to step 14:
668 can be fit into 5720 8 times, resulting in a remainder of 376.
Use 8 as the next digit of our solution. 
Result so far: 122472.140718
Deduct 5344 from 5720 and we're left with 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

On to step 15:
668 can be fit into 3760 5 times, resulting in a remainder of 420.
Use 5 as the next digit of our solution. 
Result so far: 122472.1407185
Subtracting 3340 from 3760 leaves us with 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

On to step 16:
If we divide 4200 by 668, we get 6 and a remainder of 192.
Use 6 as the next digit of our solution. 
Result so far: 122472.14071856
The remainder is 192 after subtracting 4008 from 4200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

In conclusion, the division gives 122472.14071856 with a balance of 1.92e-07.