Let's divide 54421869 by 648
We want to figure out the number of times 54421869 can be divided by 648.

On to step 1:
648 goes into 5 0 times with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 648

Advancing to step 2:
The number 648 fits into 54 0 times, leaving a remainder of 54.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 54 to get 54.
Append the next digit (4) from the dividend to 54 and continue with: 544 / 648

Let's proceed to step 3:
648 can be fit into 544 0 times, resulting in a remainder of 544.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 544 after subtracting 0 from 544.
Take the next digit (2) from the dividend and append it to 544, then repeat: 5442 / 648

Let's proceed to step 4:
648 goes into 5442 8 times with a remainder of 258.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 5184 away from 5442, we end up with 258.
Fetch the next digit (1) from the dividend, attach it to 258 and continue: 2581 / 648

Step 5:
648 goes into 2581 3 times with a remainder of 637.
Write down 3 as next digit of the result. 
Result so far: 83.0
Subtracting 1944 from 2581 leaves us with 637.
Grab the next digit (8) from the dividend, add it to 637, then carry on: 6378 / 648

Step 6:
6378 divided by 648 is 9 with a remainder of 546.
Put 9 as the next digit of the answer. 
Result so far: 839.0
If we take 5832 away from 6378, we end up with 546.
Include the next digit (6) from the dividend after 546, then repeat: 5466 / 648

Advancing to step 7:
If we divide 5466 by 648, we get 8 and a remainder of 282.
Record the quotient 8 as the next digit in the result. 
Result so far: 8398.0
The remainder is 282 after subtracting 5184 from 5466.
Grab the next digit (9) from the dividend, add it to 282, then carry on: 2829 / 648

Advancing to step 8:
The number 648 fits into 2829 4 times, leaving a remainder of 237.
The number 4 becomes the next digit in our result. 
Result so far: 83984.0
Subtract 2592 from 2829 to get 237.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2370, and continue the process.

On to step 9:
The number 648 fits into 2370 3 times, leaving a remainder of 426.
The next digit of our result is 3. 
Result so far: 83984.3
Deduct 1944 from 2370 and we're left with 426.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4260, and continue the process.

Step 10:
648 goes into 4260 6 times with a remainder of 372.
Use 6 as the next digit of our solution. 
Result so far: 83984.36
Subtracting 3888 from 4260 leaves us with 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Going ahead to step 11:
The number 648 fits into 3720 5 times, leaving a remainder of 480.
Use 5 as the next digit of our solution. 
Result so far: 83984.365
Subtract 3240 from 3720 to get 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

On to step 12:
The number 648 fits into 4800 7 times, leaving a remainder of 264.
Write down 7 as next digit of the result. 
Result so far: 83984.3657
Subtracting 4536 from 4800 leaves us with 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Moving on to step 13:
The number 648 fits into 2640 4 times, leaving a remainder of 48.
The number 4 becomes the next digit in our result. 
Result so far: 83984.36574
If we subtract 2592 from 2640, 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.

Step 14:
When dividing 480 by 648, we get 0 with a remainder of 480.
The number 0 becomes the next digit in our result. 
Result so far: 83984.36574
The remainder is 480 after subtracting 0 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Step 15:
When dividing 4800 by 648, we get 7 with a remainder of 264.
Record the quotient 7 as the next digit in the result. 
Result so far: 83984.3657407
Deduct 4536 from 4800 and we're left with 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

On to step 16:
If we divide 2640 by 648, we get 4 and a remainder of 48.
Put 4 as the next digit of the answer. 
Result so far: 83984.36574074
Deduct 2592 from 2640 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

After the division, we end up with 83984.36574074 and a remainder of 4.8e-08.