We divide 643611 by 80
Let's see how many times 80 fits into 643611.

Let's proceed to step 1:
6 divided by 80 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
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 / 80

Step 2:
80 goes into 64 0 times with a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 64, we end up with 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.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
The remainder is 3 after subtracting 640 from 643.
Include the next digit (6) from the dividend after 3, then repeat: 36 / 80

Step 4:
When dividing 36 by 80, we get 0 with a remainder of 36.
The number 0 becomes the next digit in our result. 
Result so far: 80.0
If we subtract 0 from 36, we get 36.
Take the next digit (1) from the dividend and append it to 36, then repeat: 361 / 80

Advancing to step 5:
80 goes into 361 4 times with a remainder of 41.
Put 4 as the next digit of the answer. 
Result so far: 804.0
Subtract 320 from 361 to get 41.
Include the next digit (1) from the dividend after 41, then repeat: 411 / 80

On to step 6:
80 goes into 411 5 times with a remainder of 11.
The number 5 becomes the next digit in our result. 
Result so far: 8045.0
If we subtract 400 from 411, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 7:
If we divide 110 by 80, we get 1 and a remainder of 30.
Write down 1 as next digit of the result. 
Result so far: 8045.1
Subtracting 80 from 110 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 8:
If we divide 300 by 80, we get 3 and a remainder of 60.
Use 3 as the next digit of our solution. 
Result so far: 8045.13
If we take 240 away from 300, we end up 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.

On to step 9:
80 can be fit into 600 7 times, resulting in a remainder of 40.
The next digit of our result is 7. 
Result so far: 8045.137
If we take 560 away from 600, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 10:
The number 80 fits into 400 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 8045.1375
The remainder is 0 after subtracting 400 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 11:
80 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: 8045.1375
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.

Moving on to step 12:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 8045.1375
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.

In conclusion, the division gives 8045.1375 with a balance of 0.0.