We look at the division of 644689 by 57 
We're looking to find how many times 57 goes into 644689.

Step 1:
6 divided by 57 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 57

Going ahead to step 2:
64 divided by 57 is 1 with a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 7 after subtracting 57 from 64.
Grab the next digit (4) from the dividend, add it to 7, then carry on: 74 / 57

Going ahead to step 3:
57 goes into 74 1 times with a remainder of 17.
The next digit of our result is 1. 
Result so far: 11.0
If we take 57 away from 74, we end up with 17.
Bring next digit (6) of the dividend behind the 17 and repeat the process: 176 / 57

Moving on to step 4:
If we divide 176 by 57, we get 3 and a remainder of 5.
The next digit of our result is 3. 
Result so far: 113.0
Subtract 171 from 176 to get 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 57

Advancing to step 5:
The number 57 fits into 58 1 times, leaving a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 1131.0
Subtract 57 from 58 to get 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 57

Let's proceed to step 6:
The number 57 fits into 19 0 times, leaving a remainder of 19.
Use 0 as the next digit of our solution. 
Result so far: 11310.0
Subtracting 0 from 19 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 7:
If we divide 190 by 57, we get 3 and a remainder of 19.
The next digit of our result is 3. 
Result so far: 11310.3
Subtracting 171 from 190 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 8:
57 can be fit into 190 3 times, resulting in a remainder of 19.
Put 3 as the next digit of the answer. 
Result so far: 11310.33
If we subtract 171 from 190, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

The final outcome is 11310.33, with a leftover of 0.019.