81128009 ÷ 648 
We want to divide 81128009 by 648.

Advancing to step 1:
648 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 648

On to step 2:
81 divided by 648 is 0 with a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Append the next digit (1) from the dividend to 81 and continue with: 811 / 648

Moving on to step 3:
The number 648 fits into 811 1 times, leaving a remainder of 163.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 648 from 811 to get 163.
Grab the next digit (2) from the dividend, add it to 163, then carry on: 1632 / 648

Going ahead to step 4:
The number 648 fits into 1632 2 times, leaving a remainder of 336.
Put 2 as the next digit of the answer. 
Result so far: 12.0
If we take 1296 away from 1632, we end up with 336.
Bring next digit (8) of the dividend behind the 336 and repeat the process: 3368 / 648

On to step 5:
When dividing 3368 by 648, we get 5 with a remainder of 128.
Put 5 as the next digit of the answer. 
Result so far: 125.0
Subtract 3240 from 3368 to get 128.
Bring next digit (0) of the dividend behind the 128 and repeat the process: 1280 / 648

Going ahead to step 6:
1280 divided by 648 is 1 with a remainder of 632.
The number 1 becomes the next digit in our result. 
Result so far: 1251.0
The remainder is 632 after subtracting 648 from 1280.
Bring next digit (0) of the dividend behind the 632 and repeat the process: 6320 / 648

Let's proceed to step 7:
648 can be fit into 6320 9 times, resulting in a remainder of 488.
Put 9 as the next digit of the answer. 
Result so far: 12519.0
Subtract 5832 from 6320 to get 488.
Take the next digit (9) from the dividend and append it to 488, then repeat: 4889 / 648

On to step 8:
When dividing 4889 by 648, we get 7 with a remainder of 353.
Write down 7 as next digit of the result. 
Result so far: 125197.0
The remainder is 353 after subtracting 4536 from 4889.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3530, and continue the process.

On to step 9:
648 goes into 3530 5 times with a remainder of 290.
Use 5 as the next digit of our solution. 
Result so far: 125197.5
Subtracting 3240 from 3530 leaves us with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Advancing to step 10:
When dividing 2900 by 648, we get 4 with a remainder of 308.
Write down 4 as next digit of the result. 
Result so far: 125197.54
Subtracting 2592 from 2900 leaves us with 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

On to step 11:
The number 648 fits into 3080 4 times, leaving a remainder of 488.
The number 4 becomes the next digit in our result. 
Result so far: 125197.544
The remainder is 488 after subtracting 2592 from 3080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4880, and continue the process.

Our division results in 125197.544 with a remaining 0.0488.