We're dividing 857671 by 80 
The aim is to understand the frequency of 80 in 857671.

Advancing to step 1:
8 divided by 80 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 80

Step 2:
80 goes into 85 1 times with a remainder of 5.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 5 after subtracting 80 from 85.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 80

On to step 3:
57 divided by 80 is 0 with a remainder of 57.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Subtract 0 from 57 to get 57.
Append the next digit (6) from the dividend to 57 and continue with: 576 / 80

Moving on to step 4:
When dividing 576 by 80, we get 7 with a remainder of 16.
Put 7 as the next digit of the answer. 
Result so far: 107.0
If we take 560 away from 576, we end up with 16.
Bring next digit (7) of the dividend behind the 16 and repeat the process: 167 / 80

Let's proceed to step 5:
When dividing 167 by 80, we get 2 with a remainder of 7.
Record the quotient 2 as the next digit in the result. 
Result so far: 1072.0
The remainder is 7 after subtracting 160 from 167.
Fetch the next digit (1) from the dividend, attach it to 7 and continue: 71 / 80

On to step 6:
When dividing 71 by 80, we get 0 with a remainder of 71.
Put 0 as the next digit of the answer. 
Result so far: 10720.0
The remainder is 71 after subtracting 0 from 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 7:
When dividing 710 by 80, we get 8 with a remainder of 70.
Write down 8 as next digit of the result. 
Result so far: 10720.8
If we subtract 640 from 710, we get 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.
The next digit of our result is 8. 
Result so far: 10720.88
Subtracting 640 from 700 leaves us 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.

The final outcome is 10720.88, with a leftover of 0.06.