81385704 divided by 648 
We want to divide 81385704 by 648.

Advancing to step 1:
648 can be fit into 8 0 times, resulting in a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 648

Let's proceed to step 2:
648 can be fit into 81 0 times, resulting in a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 81 after subtracting 0 from 81.
Include the next digit (3) from the dividend after 81, then repeat: 813 / 648

Let's proceed to step 3:
813 divided by 648 is 1 with a remainder of 165.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 648 away from 813, we end up with 165.
Fetch the next digit (8) from the dividend, attach it to 165 and continue: 1658 / 648

Step 4:
648 can be fit into 1658 2 times, resulting in a remainder of 362.
Write down 2 as next digit of the result. 
Result so far: 12.0
Deduct 1296 from 1658 and we're left with 362.
Take the next digit (5) from the dividend and append it to 362, then repeat: 3625 / 648

Let's proceed to step 5:
The number 648 fits into 3625 5 times, leaving a remainder of 385.
Use 5 as the next digit of our solution. 
Result so far: 125.0
Deduct 3240 from 3625 and we're left with 385.
Include the next digit (7) from the dividend after 385, then repeat: 3857 / 648

Step 6:
648 can be fit into 3857 5 times, resulting in a remainder of 617.
Write down 5 as next digit of the result. 
Result so far: 1255.0
Deduct 3240 from 3857 and we're left with 617.
Include the next digit (0) from the dividend after 617, then repeat: 6170 / 648

Moving on to step 7:
6170 divided by 648 is 9 with a remainder of 338.
Use 9 as the next digit of our solution. 
Result so far: 12559.0
Deduct 5832 from 6170 and we're left with 338.
Include the next digit (4) from the dividend after 338, then repeat: 3384 / 648

Moving on to step 8:
3384 divided by 648 is 5 with a remainder of 144.
Put 5 as the next digit of the answer. 
Result so far: 125595.0
Subtract 3240 from 3384 to get 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Moving on to step 9:
648 goes into 1440 2 times with a remainder of 144.
Use 2 as the next digit of our solution. 
Result so far: 125595.2
If we take 1296 away from 1440, we end up with 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Moving on to step 10:
If we divide 1440 by 648, we get 2 and a remainder of 144.
Record the quotient 2 as the next digit in the result. 
Result so far: 125595.22
If we subtract 1296 from 1440, we get 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

The final result is 125595.22 with a remainder of 0.144.