53584442 ÷ 644 
We want to figure out the number of times 53584442 can be divided by 644.

Step 1:
5 divided by 644 is 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (3) from the dividend, add it to 5, then carry on: 53 / 644

Going ahead to step 2:
If we divide 53 by 644, we get 0 and a remainder of 53.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 53 after subtracting 0 from 53.
Grab the next digit (5) from the dividend, add it to 53, then carry on: 535 / 644

On to step 3:
535 divided by 644 is 0 with a remainder of 535.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 535 to get 535.
Grab the next digit (8) from the dividend, add it to 535, then carry on: 5358 / 644

Going ahead to step 4:
644 goes into 5358 8 times with a remainder of 206.
The next digit of our result is 8. 
Result so far: 8.0
Deduct 5152 from 5358 and we're left with 206.
Fetch the next digit (4) from the dividend, attach it to 206 and continue: 2064 / 644

Moving on to step 5:
The number 644 fits into 2064 3 times, leaving a remainder of 132.
The next digit of our result is 3. 
Result so far: 83.0
If we subtract 1932 from 2064, we get 132.
Take the next digit (4) from the dividend and append it to 132, then repeat: 1324 / 644

Going ahead to step 6:
1324 divided by 644 is 2 with a remainder of 36.
Record the quotient 2 as the next digit in the result. 
Result so far: 832.0
If we take 1288 away from 1324, we end up with 36.
Bring next digit (4) of the dividend behind the 36 and repeat the process: 364 / 644

On to step 7:
When dividing 364 by 644, we get 0 with a remainder of 364.
The number 0 becomes the next digit in our result. 
Result so far: 8320.0
If we subtract 0 from 364, we get 364.
Take the next digit (2) from the dividend and append it to 364, then repeat: 3642 / 644

Let's proceed to step 8:
When dividing 3642 by 644, we get 5 with a remainder of 422.
The number 5 becomes the next digit in our result. 
Result so far: 83205.0
Subtracting 3220 from 3642 leaves us with 422.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4220, and continue the process.

Moving on to step 9:
When dividing 4220 by 644, we get 6 with a remainder of 356.
Put 6 as the next digit of the answer. 
Result so far: 83205.6
The remainder is 356 after subtracting 3864 from 4220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3560, and continue the process.

On to step 10:
When dividing 3560 by 644, we get 5 with a remainder of 340.
Use 5 as the next digit of our solution. 
Result so far: 83205.65
If we take 3220 away from 3560, we end up with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Let's proceed to step 11:
3400 divided by 644 is 5 with a remainder of 180.
The number 5 becomes the next digit in our result. 
Result so far: 83205.655
Deduct 3220 from 3400 and we're left with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

The final result is 83205.655 with a remainder of 0.018.