We divide 671220 by 80
We want to figure out the number of times 671220 can be divided by 80.

Step 1:
The number 80 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (7) of the dividend behind the 6 and repeat the process: 67 / 80

Let's proceed to step 2:
The number 80 fits into 67 0 times, leaving a remainder of 67.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 67 to get 67.
Append the next digit (1) from the dividend to 67 and continue with: 671 / 80

Going ahead to step 3:
The number 80 fits into 671 8 times, leaving a remainder of 31.
Put 8 as the next digit of the answer. 
Result so far: 8.0
The remainder is 31 after subtracting 640 from 671.
Grab the next digit (2) from the dividend, add it to 31, then carry on: 312 / 80

Moving on to step 4:
If we divide 312 by 80, we get 3 and a remainder of 72.
Use 3 as the next digit of our solution. 
Result so far: 83.0
If we take 240 away from 312, we end up with 72.
Append the next digit (2) from the dividend to 72 and continue with: 722 / 80

Step 5:
If we divide 722 by 80, we get 9 and a remainder of 2.
The next digit of our result is 9. 
Result so far: 839.0
Subtracting 720 from 722 leaves us with 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 80

Going ahead to step 6:
20 divided by 80 is 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 8390.0
Deduct 0 from 20 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.

Going ahead to step 7:
80 can be fit into 200 2 times, resulting in a remainder of 40.
Record the quotient 2 as the next digit in the result. 
Result so far: 8390.2
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.

Let's proceed to step 8:
If we divide 400 by 80, we get 5 and a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 8390.25
Subtract 400 from 400 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.

Advancing to step 9:
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: 8390.25
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.

Moving on to step 10:
0 divided by 80 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 8390.25
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.

After the division, we end up with 8390.25 and a remainder of 0.0.