55919311 ÷ 648 
We want to figure out the number of times 55919311 can be divided by 648.

Step 1:
The number 648 fits into 5 0 times, leaving 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.
Append the next digit (5) from the dividend to 5 and continue with: 55 / 648

Going ahead to step 2:
648 can be fit into 55 0 times, resulting in a remainder of 55.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 55 to get 55.
Append the next digit (9) from the dividend to 55 and continue with: 559 / 648

On to step 3:
648 can be fit into 559 0 times, resulting in a remainder of 559.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 559 to get 559.
Bring next digit (1) of the dividend behind the 559 and repeat the process: 5591 / 648

Going ahead to step 4:
If we divide 5591 by 648, we get 8 and a remainder of 407.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Deduct 5184 from 5591 and we're left with 407.
Grab the next digit (9) from the dividend, add it to 407, then carry on: 4079 / 648

Step 5:
If we divide 4079 by 648, we get 6 and a remainder of 191.
The next digit of our result is 6. 
Result so far: 86.0
Subtract 3888 from 4079 to get 191.
Fetch the next digit (3) from the dividend, attach it to 191 and continue: 1913 / 648

On to step 6:
648 can be fit into 1913 2 times, resulting in a remainder of 617.
Record the quotient 2 as the next digit in the result. 
Result so far: 862.0
If we subtract 1296 from 1913, we get 617.
Append the next digit (1) from the dividend to 617 and continue with: 6171 / 648

Moving on to step 7:
If we divide 6171 by 648, we get 9 and a remainder of 339.
The number 9 becomes the next digit in our result. 
Result so far: 8629.0
If we take 5832 away from 6171, we end up with 339.
Bring next digit (1) of the dividend behind the 339 and repeat the process: 3391 / 648

Let's proceed to step 8:
3391 divided by 648 is 5 with a remainder of 151.
Record the quotient 5 as the next digit in the result. 
Result so far: 86295.0
Subtract 3240 from 3391 to get 151.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1510, and continue the process.

Going ahead to step 9:
If we divide 1510 by 648, we get 2 and a remainder of 214.
Record the quotient 2 as the next digit in the result. 
Result so far: 86295.2
Subtracting 1296 from 1510 leaves us with 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

Let's proceed to step 10:
2140 divided by 648 is 3 with a remainder of 196.
Write down 3 as next digit of the result. 
Result so far: 86295.23
The remainder is 196 after subtracting 1944 from 2140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Step 11:
The number 648 fits into 1960 3 times, leaving a remainder of 16.
Put 3 as the next digit of the answer. 
Result so far: 86295.233
The remainder is 16 after subtracting 1944 from 1960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Our division results in 86295.233 with a remaining 0.0016.