839439 divided by 80 
We want to divide 839439 by 80.

Moving on to step 1:
If we divide 8 by 80, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 80

On to step 2:
The number 80 fits into 83 1 times, leaving a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 80 from 83 to get 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 80

Step 3:
80 can be fit into 39 0 times, resulting in a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 10.0
The remainder is 39 after subtracting 0 from 39.
Include the next digit (4) from the dividend after 39, then repeat: 394 / 80

Let's proceed to step 4:
394 divided by 80 is 4 with a remainder of 74.
The number 4 becomes the next digit in our result. 
Result so far: 104.0
Deduct 320 from 394 and we're left with 74.
Bring next digit (3) of the dividend behind the 74 and repeat the process: 743 / 80

On to step 5:
When dividing 743 by 80, we get 9 with a remainder of 23.
Put 9 as the next digit of the answer. 
Result so far: 1049.0
If we take 720 away from 743, we end up with 23.
Grab the next digit (9) from the dividend, add it to 23, then carry on: 239 / 80

On to step 6:
80 can be fit into 239 2 times, resulting in a remainder of 79.
The next digit of our result is 2. 
Result so far: 10492.0
Subtract 160 from 239 to get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Going ahead to step 7:
If we divide 790 by 80, we get 9 and a remainder of 70.
The number 9 becomes the next digit in our result. 
Result so far: 10492.9
Subtract 720 from 790 to 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.

On to step 8:
80 goes into 700 8 times with a remainder of 60.
The number 8 becomes the next digit in our result. 
Result so far: 10492.98
If we subtract 640 from 700, we get 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:
When dividing 600 by 80, we get 7 with a remainder of 40.
Use 7 as the next digit of our solution. 
Result so far: 10492.987
Subtract 560 from 600 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 10:
80 goes into 400 5 times with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 10492.9875
Deduct 400 from 400 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 11:
0 divided by 80 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 10492.9875
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.

Advancing to step 12:
80 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10492.9875
If we take 0 away from 0, 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.

The final outcome is 10492.9875, with a leftover of 0.0.