We're dividing 643652 by 80 
We want to divide 643652 by 80.

Advancing to step 1:
If we divide 6 by 80, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 80

Going ahead to step 2:
80 can be fit into 64 0 times, resulting in 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.
Bring next digit (3) of the dividend behind the 64 and repeat the process: 643 / 80

Moving on to step 3:
80 can be fit into 643 8 times, resulting in a remainder of 3.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Deduct 640 from 643 and we're left with 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 80

Going ahead to step 4:
The number 80 fits into 36 0 times, leaving a remainder of 36.
Record the quotient 0 as the next digit in the result. 
Result so far: 80.0
The remainder is 36 after subtracting 0 from 36.
Bring next digit (5) of the dividend behind the 36 and repeat the process: 365 / 80

On to step 5:
When dividing 365 by 80, we get 4 with a remainder of 45.
The number 4 becomes the next digit in our result. 
Result so far: 804.0
If we take 320 away from 365, we end up with 45.
Grab the next digit (2) from the dividend, add it to 45, then carry on: 452 / 80

Advancing to step 6:
If we divide 452 by 80, we get 5 and a remainder of 52.
Write down 5 as next digit of the result. 
Result so far: 8045.0
Subtracting 400 from 452 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Step 7:
520 divided by 80 is 6 with a remainder of 40.
The next digit of our result is 6. 
Result so far: 8045.6
The remainder is 40 after subtracting 480 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 8:
400 divided by 80 is 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 8045.65
If we take 400 away from 400, we end up 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.

Step 9:
When dividing 0 by 80, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 8045.65
Deduct 0 from 0 and we're left 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.

Step 10:
The number 80 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 8045.65
Deduct 0 from 0 and we're left 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.

The final outcome is 8045.65, with a leftover of 0.0.