Let's divide 409639 by 80
We want to divide 409639 by 80.

Going ahead to step 1:
The number 80 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Grab the next digit (0) from the dividend, add it to 4, then carry on: 40 / 80

Going ahead to step 2:
When dividing 40 by 80, we get 0 with a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 40, we get 40.
Bring next digit (9) of the dividend behind the 40 and repeat the process: 409 / 80

Let's proceed to step 3:
The number 80 fits into 409 5 times, leaving a remainder of 9.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we subtract 400 from 409, we get 9.
Take the next digit (6) from the dividend and append it to 9, then repeat: 96 / 80

On to step 4:
80 goes into 96 1 times with a remainder of 16.
The next digit of our result is 1. 
Result so far: 51.0
If we subtract 80 from 96, we get 16.
Include the next digit (3) from the dividend after 16, then repeat: 163 / 80

Moving on to step 5:
The number 80 fits into 163 2 times, leaving a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 512.0
The remainder is 3 after subtracting 160 from 163.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 80

Let's proceed to step 6:
80 can be fit into 39 0 times, resulting in a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 5120.0
If we take 0 away from 39, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Going ahead to step 7:
80 goes into 390 4 times with a remainder of 70.
Write down 4 as next digit of the result. 
Result so far: 5120.4
Subtracting 320 from 390 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 8:
80 can be fit into 700 8 times, resulting in a remainder of 60.
Use 8 as the next digit of our solution. 
Result so far: 5120.48
If we take 640 away from 700, 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.

Moving on to step 9:
600 divided by 80 is 7 with a remainder of 40.
Use 7 as the next digit of our solution. 
Result so far: 5120.487
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.

Step 10:
If we divide 400 by 80, we get 5 and a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 5120.4875
If we subtract 400 from 400, 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.

Advancing to step 11:
0 divided by 80 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 5120.4875
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.

Advancing to step 12:
0 divided by 80 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 5120.4875
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 5120.4875, with a leftover of 0.0.