391405 ÷ 80 
Our goal is to divide 391405 by 80.

Moving on to step 1:
When dividing 3 by 80, we get 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 80

Moving on to step 2:
80 can be fit into 39 0 times, resulting in a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Grab the next digit (1) from the dividend, add it to 39, then carry on: 391 / 80

Advancing to step 3:
The number 80 fits into 391 4 times, leaving a remainder of 71.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
The remainder is 71 after subtracting 320 from 391.
Bring next digit (4) of the dividend behind the 71 and repeat the process: 714 / 80

On to step 4:
The number 80 fits into 714 8 times, leaving a remainder of 74.
Record the quotient 8 as the next digit in the result. 
Result so far: 48.0
Subtract 640 from 714 to get 74.
Fetch the next digit (0) from the dividend, attach it to 74 and continue: 740 / 80

Going ahead to step 5:
The number 80 fits into 740 9 times, leaving a remainder of 20.
Put 9 as the next digit of the answer. 
Result so far: 489.0
Subtract 720 from 740 to get 20.
Include the next digit (5) from the dividend after 20, then repeat: 205 / 80

Let's proceed to step 6:
The number 80 fits into 205 2 times, leaving a remainder of 45.
Write down 2 as next digit of the result. 
Result so far: 4892.0
Subtracting 160 from 205 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 7:
If we divide 450 by 80, we get 5 and a remainder of 50.
Write down 5 as next digit of the result. 
Result so far: 4892.5
The remainder is 50 after subtracting 400 from 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 8:
500 divided by 80 is 6 with a remainder of 20.
Write down 6 as next digit of the result. 
Result so far: 4892.56
If we take 480 away from 500, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 9:
80 goes into 200 2 times with a remainder of 40.
Write down 2 as next digit of the result. 
Result so far: 4892.562
Subtract 160 from 200 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.

On to step 10:
80 can be fit into 400 5 times, resulting in a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 4892.5625
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.

Let's proceed to step 11:
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: 4892.5625
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 12:
0 divided by 80 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 4892.5625
Subtracting 0 from 0 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.

After the division, we end up with 4892.5625 and a remainder of 0.0.