Let's divide 644457 by 99
Our goal is to divide 644457 by 99.

Let's proceed to step 1:
The number 99 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 99

Step 2:
The number 99 fits into 64 0 times, leaving a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 64 and we're left with 64.
Bring next digit (4) of the dividend behind the 64 and repeat the process: 644 / 99

Let's proceed to step 3:
644 divided by 99 is 6 with a remainder of 50.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we take 594 away from 644, we end up with 50.
Fetch the next digit (4) from the dividend, attach it to 50 and continue: 504 / 99

Going ahead to step 4:
If we divide 504 by 99, we get 5 and a remainder of 9.
Put 5 as the next digit of the answer. 
Result so far: 65.0
Deduct 495 from 504 and we're left with 9.
Include the next digit (5) from the dividend after 9, then repeat: 95 / 99

Advancing to step 5:
When dividing 95 by 99, we get 0 with a remainder of 95.
Put 0 as the next digit of the answer. 
Result so far: 650.0
The remainder is 95 after subtracting 0 from 95.
Bring next digit (7) of the dividend behind the 95 and repeat the process: 957 / 99

Advancing to step 6:
957 divided by 99 is 9 with a remainder of 66.
The next digit of our result is 9. 
Result so far: 6509.0
Deduct 891 from 957 and we're left with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 7:
99 can be fit into 660 6 times, resulting in a remainder of 66.
Put 6 as the next digit of the answer. 
Result so far: 6509.6
Subtract 594 from 660 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Going ahead to step 8:
The number 99 fits into 660 6 times, leaving a remainder of 66.
The next digit of our result is 6. 
Result so far: 6509.66
If we subtract 594 from 660, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

The final outcome is 6509.66, with a leftover of 0.066.