639017 ÷ 80 
We want to divide 639017 by 80.

Moving on to step 1:
80 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 80

On to step 2:
80 goes into 63 0 times with a remainder of 63.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Include the next digit (9) from the dividend after 63, then repeat: 639 / 80

Step 3:
The number 80 fits into 639 7 times, leaving a remainder of 79.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we subtract 560 from 639, we get 79.
Bring next digit (0) of the dividend behind the 79 and repeat the process: 790 / 80

Going ahead to step 4:
When dividing 790 by 80, we get 9 with a remainder of 70.
Put 9 as the next digit of the answer. 
Result so far: 79.0
Subtract 720 from 790 to get 70.
Append the next digit (1) from the dividend to 70 and continue with: 701 / 80

Step 5:
80 goes into 701 8 times with a remainder of 61.
The number 8 becomes the next digit in our result. 
Result so far: 798.0
Subtracting 640 from 701 leaves us with 61.
Grab the next digit (7) from the dividend, add it to 61, then carry on: 617 / 80

Advancing to step 6:
The number 80 fits into 617 7 times, leaving a remainder of 57.
The next digit of our result is 7. 
Result so far: 7987.0
Deduct 560 from 617 and we're left with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Step 7:
If we divide 570 by 80, we get 7 and a remainder of 10.
The next digit of our result is 7. 
Result so far: 7987.7
Deduct 560 from 570 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
80 can be fit into 100 1 times, resulting in a remainder of 20.
Use 1 as the next digit of our solution. 
Result so far: 7987.71
Deduct 80 from 100 and we're left 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.

On to step 9:
The number 80 fits into 200 2 times, leaving a remainder of 40.
Put 2 as the next digit of the answer. 
Result so far: 7987.712
Deduct 160 from 200 and we're left 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.

Advancing to step 10:
80 goes into 400 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 7987.7125
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.

Going ahead to step 11:
0 divided by 80 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 7987.7125
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.

Going ahead to step 12:
When dividing 0 by 80, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 7987.7125
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.

After the division, we end up with 7987.7125 and a remainder of 0.0.