646359 divided by 80 
We want to figure out the number of times 646359 can be divided by 80.

Advancing to step 1:
If we divide 6 by 80, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 80

Step 2:
When dividing 64 by 80, we get 0 with a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Take the next digit (6) from the dividend and append it to 64, then repeat: 646 / 80

Let's proceed to step 3:
The number 80 fits into 646 8 times, leaving a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 640 from 646, we get 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 80

Moving on to step 4:
The number 80 fits into 63 0 times, leaving a remainder of 63.
Use 0 as the next digit of our solution. 
Result so far: 80.0
Subtracting 0 from 63 leaves us with 63.
Include the next digit (5) from the dividend after 63, then repeat: 635 / 80

Moving on to step 5:
If we divide 635 by 80, we get 7 and a remainder of 75.
The number 7 becomes the next digit in our result. 
Result so far: 807.0
If we subtract 560 from 635, we get 75.
Grab the next digit (9) from the dividend, add it to 75, then carry on: 759 / 80

Let's proceed to step 6:
80 goes into 759 9 times with a remainder of 39.
Record the quotient 9 as the next digit in the result. 
Result so far: 8079.0
The remainder is 39 after subtracting 720 from 759.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 7:
80 goes into 390 4 times with a remainder of 70.
The number 4 becomes the next digit in our result. 
Result so far: 8079.4
If we subtract 320 from 390, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 8:
When dividing 700 by 80, we get 8 with a remainder of 60.
Record the quotient 8 as the next digit in the result. 
Result so far: 8079.48
Deduct 640 from 700 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 9:
If we divide 600 by 80, we get 7 and a remainder of 40.
Use 7 as the next digit of our solution. 
Result so far: 8079.487
The remainder is 40 after subtracting 560 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 10:
If we divide 400 by 80, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 8079.4875
Subtracting 400 from 400 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.

Going ahead to step 11:
If we divide 0 by 80, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 8079.4875
Subtract 0 from 0 to 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.

On to step 12:
0 divided by 80 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 8079.4875
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 8079.4875 and a remainder of 0.0.