We're dividing 91371562 by 644 
Our goal is to divide 91371562 by 644.

Advancing to step 1:
644 goes into 9 0 times with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 644

On to step 2:
644 can be fit into 91 0 times, resulting in a remainder of 91.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 91, we end up with 91.
Append the next digit (3) from the dividend to 91 and continue with: 913 / 644

Let's proceed to step 3:
If we divide 913 by 644, we get 1 and a remainder of 269.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 269 after subtracting 644 from 913.
Grab the next digit (7) from the dividend, add it to 269, then carry on: 2697 / 644

Step 4:
The number 644 fits into 2697 4 times, leaving a remainder of 121.
Put 4 as the next digit of the answer. 
Result so far: 14.0
The remainder is 121 after subtracting 2576 from 2697.
Take the next digit (1) from the dividend and append it to 121, then repeat: 1211 / 644

Going ahead to step 5:
644 goes into 1211 1 times with a remainder of 567.
Record the quotient 1 as the next digit in the result. 
Result so far: 141.0
Subtract 644 from 1211 to get 567.
Include the next digit (5) from the dividend after 567, then repeat: 5675 / 644

Step 6:
5675 divided by 644 is 8 with a remainder of 523.
The number 8 becomes the next digit in our result. 
Result so far: 1418.0
Subtract 5152 from 5675 to get 523.
Grab the next digit (6) from the dividend, add it to 523, then carry on: 5236 / 644

Going ahead to step 7:
When dividing 5236 by 644, we get 8 with a remainder of 84.
The next digit of our result is 8. 
Result so far: 14188.0
Deduct 5152 from 5236 and we're left with 84.
Grab the next digit (2) from the dividend, add it to 84, then carry on: 842 / 644

On to step 8:
644 goes into 842 1 times with a remainder of 198.
Put 1 as the next digit of the answer. 
Result so far: 141881.0
Subtract 644 from 842 to get 198.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1980, and continue the process.

Advancing to step 9:
644 can be fit into 1980 3 times, resulting in a remainder of 48.
Use 3 as the next digit of our solution. 
Result so far: 141881.3
If we subtract 1932 from 1980, 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.

Moving on to step 10:
644 can be fit into 480 0 times, resulting in a remainder of 480.
Use 0 as the next digit of our solution. 
Result so far: 141881.3
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 11:
4800 divided by 644 is 7 with a remainder of 292.
The number 7 becomes the next digit in our result. 
Result so far: 141881.307
If we take 4508 away from 4800, we end up with 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Going ahead to step 12:
When dividing 2920 by 644, we get 4 with a remainder of 344.
Write down 4 as next digit of the result. 
Result so far: 141881.3074
If we subtract 2576 from 2920, we get 344.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

Let's proceed to step 13:
The number 644 fits into 3440 5 times, leaving a remainder of 220.
Write down 5 as next digit of the result. 
Result so far: 141881.30745
Subtracting 3220 from 3440 leaves us with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Let's proceed to step 14:
644 can be fit into 2200 3 times, resulting in a remainder of 268.
Record the quotient 3 as the next digit in the result. 
Result so far: 141881.307453
The remainder is 268 after subtracting 1932 from 2200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Moving on to step 15:
2680 divided by 644 is 4 with a remainder of 104.
The number 4 becomes the next digit in our result. 
Result so far: 141881.3074534
Subtracting 2576 from 2680 leaves us with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Step 16:
The number 644 fits into 1040 1 times, leaving a remainder of 396.
Put 1 as the next digit of the answer. 
Result so far: 141881.30745341
Subtracting 644 from 1040 leaves us with 396.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3960, and continue the process.

The final outcome is 141881.30745341, with a leftover of 3.96e-07.