We're dividing 12769657 by 644 
Let's see how many times 644 fits into 12769657.

Going ahead to step 1:
When dividing 1 by 644, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 644

Going ahead to step 2:
When dividing 12 by 644, we get 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Bring next digit (7) of the dividend behind the 12 and repeat the process: 127 / 644

Let's proceed to step 3:
If we divide 127 by 644, we get 0 and a remainder of 127.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 127, we get 127.
Grab the next digit (6) from the dividend, add it to 127, then carry on: 1276 / 644

Step 4:
The number 644 fits into 1276 1 times, leaving a remainder of 632.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 644 from 1276 leaves us with 632.
Take the next digit (9) from the dividend and append it to 632, then repeat: 6329 / 644

Moving on to step 5:
When dividing 6329 by 644, we get 9 with a remainder of 533.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
Subtract 5796 from 6329 to get 533.
Append the next digit (6) from the dividend to 533 and continue with: 5336 / 644

Moving on to step 6:
644 goes into 5336 8 times with a remainder of 184.
The next digit of our result is 8. 
Result so far: 198.0
Subtracting 5152 from 5336 leaves us with 184.
Grab the next digit (5) from the dividend, add it to 184, then carry on: 1845 / 644

On to step 7:
The number 644 fits into 1845 2 times, leaving a remainder of 557.
The next digit of our result is 2. 
Result so far: 1982.0
If we subtract 1288 from 1845, we get 557.
Bring next digit (7) of the dividend behind the 557 and repeat the process: 5577 / 644

Step 8:
When dividing 5577 by 644, we get 8 with a remainder of 425.
Write down 8 as next digit of the result. 
Result so far: 19828.0
Subtract 5152 from 5577 to get 425.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

Advancing to step 9:
644 can be fit into 4250 6 times, resulting in a remainder of 386.
Write down 6 as next digit of the result. 
Result so far: 19828.6
Deduct 3864 from 4250 and we're left with 386.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3860, and continue the process.

Advancing to step 10:
When dividing 3860 by 644, we get 5 with a remainder of 640.
The number 5 becomes the next digit in our result. 
Result so far: 19828.65
If we subtract 3220 from 3860, we get 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

On to step 11:
If we divide 6400 by 644, we get 9 and a remainder of 604.
Use 9 as the next digit of our solution. 
Result so far: 19828.659
If we subtract 5796 from 6400, we get 604.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6040, and continue the process.

Advancing to step 12:
6040 divided by 644 is 9 with a remainder of 244.
Record the quotient 9 as the next digit in the result. 
Result so far: 19828.6599
Deduct 5796 from 6040 and we're left with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

After the division, we end up with 19828.6599 and a remainder of 0.00244.