We're dividing 644078 by 80 
Our goal is to divide 644078 by 80.

On to step 1:
When dividing 6 by 80, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 80

Moving on to step 2:
80 can be fit into 64 0 times, resulting in a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Append the next digit (4) from the dividend to 64 and continue with: 644 / 80

Moving on to step 3:
The number 80 fits into 644 8 times, leaving a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtracting 640 from 644 leaves us with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 80

Step 4:
80 goes into 40 0 times with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 80.0
If we subtract 0 from 40, we get 40.
Take the next digit (7) from the dividend and append it to 40, then repeat: 407 / 80

Let's proceed to step 5:
80 can be fit into 407 5 times, resulting in a remainder of 7.
Use 5 as the next digit of our solution. 
Result so far: 805.0
If we subtract 400 from 407, we get 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 80

On to step 6:
When dividing 78 by 80, we get 0 with a remainder of 78.
Put 0 as the next digit of the answer. 
Result so far: 8050.0
If we subtract 0 from 78, we get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Advancing to step 7:
If we divide 780 by 80, we get 9 and a remainder of 60.
Use 9 as the next digit of our solution. 
Result so far: 8050.9
If we subtract 720 from 780, 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.

Moving on to step 8:
80 goes into 600 7 times with a remainder of 40.
Put 7 as the next digit of the answer. 
Result so far: 8050.97
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.

Going ahead to step 9:
80 goes into 400 5 times with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 8050.975
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 10:
80 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 8050.975
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.

Let's proceed to step 11:
When dividing 0 by 80, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 8050.975
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.

After the division, we end up with 8050.975 and a remainder of 0.0.