Let's divide 83908971 by 648
Our goal is to divide 83908971 by 648.

On to step 1:
If we divide 8 by 648, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 648

Advancing to step 2:
648 goes into 83 0 times with a remainder of 83.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 83, we get 83.
Include the next digit (9) from the dividend after 83, then repeat: 839 / 648

Moving on to step 3:
648 goes into 839 1 times with a remainder of 191.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 648 from 839 to get 191.
Bring next digit (0) of the dividend behind the 191 and repeat the process: 1910 / 648

Moving on to step 4:
When dividing 1910 by 648, we get 2 with a remainder of 614.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtract 1296 from 1910 to get 614.
Bring next digit (8) of the dividend behind the 614 and repeat the process: 6148 / 648

Advancing to step 5:
When dividing 6148 by 648, we get 9 with a remainder of 316.
Use 9 as the next digit of our solution. 
Result so far: 129.0
Subtracting 5832 from 6148 leaves us with 316.
Append the next digit (9) from the dividend to 316 and continue with: 3169 / 648

Moving on to step 6:
The number 648 fits into 3169 4 times, leaving a remainder of 577.
Write down 4 as next digit of the result. 
Result so far: 1294.0
Deduct 2592 from 3169 and we're left with 577.
Append the next digit (7) from the dividend to 577 and continue with: 5777 / 648

Let's proceed to step 7:
When dividing 5777 by 648, we get 8 with a remainder of 593.
Write down 8 as next digit of the result. 
Result so far: 12948.0
Subtracting 5184 from 5777 leaves us with 593.
Include the next digit (1) from the dividend after 593, then repeat: 5931 / 648

Let's proceed to step 8:
5931 divided by 648 is 9 with a remainder of 99.
The next digit of our result is 9. 
Result so far: 129489.0
Deduct 5832 from 5931 and we're left with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

On to step 9:
When dividing 990 by 648, we get 1 with a remainder of 342.
Record the quotient 1 as the next digit in the result. 
Result so far: 129489.1
Subtracting 648 from 990 leaves us with 342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

Going ahead to step 10:
3420 divided by 648 is 5 with a remainder of 180.
Record the quotient 5 as the next digit in the result. 
Result so far: 129489.15
The remainder is 180 after subtracting 3240 from 3420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

On to step 11:
The number 648 fits into 1800 2 times, leaving a remainder of 504.
Record the quotient 2 as the next digit in the result. 
Result so far: 129489.152
If we take 1296 away from 1800, we end up with 504.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

Let's proceed to step 12:
648 can be fit into 5040 7 times, resulting in a remainder of 504.
The number 7 becomes the next digit in our result. 
Result so far: 129489.1527
The remainder is 504 after subtracting 4536 from 5040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

Let's proceed to step 13:
The number 648 fits into 5040 7 times, leaving a remainder of 504.
Put 7 as the next digit of the answer. 
Result so far: 129489.15277
Subtract 4536 from 5040 to get 504.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

The final outcome is 129489.15277, with a leftover of 0.000504.