55875445 divided by 644 
We're looking to find how many times 644 goes into 55875445.

Let's proceed to step 1:
When dividing 5 by 644, we get 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 644

Advancing to step 2:
644 can be fit into 55 0 times, resulting in a remainder of 55.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 55 after subtracting 0 from 55.
Grab the next digit (8) from the dividend, add it to 55, then carry on: 558 / 644

On to step 3:
558 divided by 644 is 0 with a remainder of 558.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 558 to get 558.
Bring next digit (7) of the dividend behind the 558 and repeat the process: 5587 / 644

Going ahead to step 4:
644 can be fit into 5587 8 times, resulting in a remainder of 435.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtract 5152 from 5587 to get 435.
Fetch the next digit (5) from the dividend, attach it to 435 and continue: 4355 / 644

Advancing to step 5:
When dividing 4355 by 644, we get 6 with a remainder of 491.
Put 6 as the next digit of the answer. 
Result so far: 86.0
The remainder is 491 after subtracting 3864 from 4355.
Fetch the next digit (4) from the dividend, attach it to 491 and continue: 4914 / 644

Moving on to step 6:
644 goes into 4914 7 times with a remainder of 406.
Write down 7 as next digit of the result. 
Result so far: 867.0
Subtract 4508 from 4914 to get 406.
Grab the next digit (4) from the dividend, add it to 406, then carry on: 4064 / 644

Let's proceed to step 7:
644 goes into 4064 6 times with a remainder of 200.
Put 6 as the next digit of the answer. 
Result so far: 8676.0
Deduct 3864 from 4064 and we're left with 200.
Append the next digit (5) from the dividend to 200 and continue with: 2005 / 644

Let's proceed to step 8:
The number 644 fits into 2005 3 times, leaving a remainder of 73.
Use 3 as the next digit of our solution. 
Result so far: 86763.0
Deduct 1932 from 2005 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Moving on to step 9:
When dividing 730 by 644, we get 1 with a remainder of 86.
The number 1 becomes the next digit in our result. 
Result so far: 86763.1
Subtracting 644 from 730 leaves us with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Let's proceed to step 10:
644 goes into 860 1 times with a remainder of 216.
Put 1 as the next digit of the answer. 
Result so far: 86763.11
Deduct 644 from 860 and we're left with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

After the division, we end up with 86763.11 and a remainder of 0.216.