Let's divide 57108603 by 648
We're looking to find how many times 648 goes into 57108603.

Step 1:
If we divide 5 by 648, we get 0 and a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 648

Step 2:
When dividing 57 by 648, we get 0 with a remainder of 57.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 57, we get 57.
Fetch the next digit (1) from the dividend, attach it to 57 and continue: 571 / 648

Moving on to step 3:
571 divided by 648 is 0 with a remainder of 571.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 571, we end up with 571.
Fetch the next digit (0) from the dividend, attach it to 571 and continue: 5710 / 648

On to step 4:
648 can be fit into 5710 8 times, resulting in a remainder of 526.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 5184 away from 5710, we end up with 526.
Take the next digit (8) from the dividend and append it to 526, then repeat: 5268 / 648

Going ahead to step 5:
The number 648 fits into 5268 8 times, leaving a remainder of 84.
Write down 8 as next digit of the result. 
Result so far: 88.0
Subtracting 5184 from 5268 leaves us with 84.
Fetch the next digit (6) from the dividend, attach it to 84 and continue: 846 / 648

On to step 6:
When dividing 846 by 648, we get 1 with a remainder of 198.
Use 1 as the next digit of our solution. 
Result so far: 881.0
If we subtract 648 from 846, we get 198.
Grab the next digit (0) from the dividend, add it to 198, then carry on: 1980 / 648

On to step 7:
648 goes into 1980 3 times with a remainder of 36.
The next digit of our result is 3. 
Result so far: 8813.0
Subtracting 1944 from 1980 leaves us with 36.
Append the next digit (3) from the dividend to 36 and continue with: 363 / 648

Moving on to step 8:
The number 648 fits into 363 0 times, leaving a remainder of 363.
Use 0 as the next digit of our solution. 
Result so far: 88130.0
If we subtract 0 from 363, we get 363.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3630, and continue the process.

Advancing to step 9:
The number 648 fits into 3630 5 times, leaving a remainder of 390.
The next digit of our result is 5. 
Result so far: 88130.5
The remainder is 390 after subtracting 3240 from 3630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

Moving on to step 10:
When dividing 3900 by 648, we get 6 with a remainder of 12.
Write down 6 as next digit of the result. 
Result so far: 88130.56
If we take 3888 away from 3900, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 11:
The number 648 fits into 120 0 times, leaving a remainder of 120.
The number 0 becomes the next digit in our result. 
Result so far: 88130.56
Subtracting 0 from 120 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 12:
1200 divided by 648 is 1 with a remainder of 552.
The next digit of our result is 1. 
Result so far: 88130.5601
Subtract 648 from 1200 to get 552.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

On to step 13:
The number 648 fits into 5520 8 times, leaving a remainder of 336.
Put 8 as the next digit of the answer. 
Result so far: 88130.56018
If we subtract 5184 from 5520, we get 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Moving on to step 14:
648 goes into 3360 5 times with a remainder of 120.
Put 5 as the next digit of the answer. 
Result so far: 88130.560185
Deduct 3240 from 3360 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Moving on to step 15:
1200 divided by 648 is 1 with a remainder of 552.
The number 1 becomes the next digit in our result. 
Result so far: 88130.5601851
Subtracting 648 from 1200 leaves us with 552.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

Moving on to step 16:
648 goes into 5520 8 times with a remainder of 336.
Write down 8 as next digit of the result. 
Result so far: 88130.56018518
Subtracting 5184 from 5520 leaves us with 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

The final result is 88130.56018518 with a remainder of 3.36e-07.