We're dividing 646939 by 82 
We want to figure out the number of times 646939 can be divided by 82.

Step 1:
When dividing 6 by 82, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 82

Advancing to step 2:
If we divide 64 by 82, we get 0 and a remainder of 64.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Append the next digit (6) from the dividend to 64 and continue with: 646 / 82

Going ahead to step 3:
646 divided by 82 is 7 with a remainder of 72.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
The remainder is 72 after subtracting 574 from 646.
Append the next digit (9) from the dividend to 72 and continue with: 729 / 82

On to step 4:
When dividing 729 by 82, we get 8 with a remainder of 73.
The number 8 becomes the next digit in our result. 
Result so far: 78.0
Deduct 656 from 729 and we're left with 73.
Include the next digit (3) from the dividend after 73, then repeat: 733 / 82

Moving on to step 5:
If we divide 733 by 82, we get 8 and a remainder of 77.
Use 8 as the next digit of our solution. 
Result so far: 788.0
Subtract 656 from 733 to get 77.
Fetch the next digit (9) from the dividend, attach it to 77 and continue: 779 / 82

Going ahead to step 6:
82 can be fit into 779 9 times, resulting in a remainder of 41.
Record the quotient 9 as the next digit in the result. 
Result so far: 7889.0
The remainder is 41 after subtracting 738 from 779.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 7:
When dividing 410 by 82, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 7889.5
If we subtract 410 from 410, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
0 divided by 82 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 7889.5
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
82 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 7889.5
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 7889.5, with a leftover of 0.0.