We look at the division of 857668 by 80 
The aim is to understand the frequency of 80 in 857668.

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.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 80

On to step 2:
If we divide 85 by 80, we get 1 and 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

Moving on to step 3:
If we divide 57 by 80, we get 0 and a remainder of 57.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtracting 0 from 57 leaves us with 57.
Include the next digit (6) from the dividend after 57, then repeat: 576 / 80

Step 4:
80 can be fit into 576 7 times, resulting in a remainder of 16.
Write down 7 as next digit of the result. 
Result so far: 107.0
The remainder is 16 after subtracting 560 from 576.
Include the next digit (6) from the dividend after 16, then repeat: 166 / 80

Step 5:
The number 80 fits into 166 2 times, leaving a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 1072.0
If we take 160 away from 166, we end up with 6.
Include the next digit (8) from the dividend after 6, then repeat: 68 / 80

On to step 6:
If we divide 68 by 80, we get 0 and a remainder of 68.
The number 0 becomes the next digit in our result. 
Result so far: 10720.0
The remainder is 68 after subtracting 0 from 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Step 7:
When dividing 680 by 80, we get 8 with a remainder of 40.
The next digit of our result is 8. 
Result so far: 10720.8
If we subtract 640 from 680, we 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.

Moving on to step 8:
80 can be fit into 400 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 10720.85
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:
0 divided by 80 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10720.85
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.

Step 10:
0 divided by 80 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10720.85
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.

The final outcome is 10720.85, with a leftover of 0.0.