We look at the division of 667668 by 80 
The aim is to understand the frequency of 80 in 667668.

Let's proceed to step 1:
When dividing 6 by 80, we get 0 with 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.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 80

Let's proceed to step 2:
When dividing 66 by 80, we get 0 with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Append the next digit (7) from the dividend to 66 and continue with: 667 / 80

Going ahead to step 3:
667 divided by 80 is 8 with a remainder of 27.
Put 8 as the next digit of the answer. 
Result so far: 8.0
The remainder is 27 after subtracting 640 from 667.
Append the next digit (6) from the dividend to 27 and continue with: 276 / 80

Step 4:
When dividing 276 by 80, we get 3 with a remainder of 36.
Use 3 as the next digit of our solution. 
Result so far: 83.0
Subtracting 240 from 276 leaves us with 36.
Append the next digit (6) from the dividend to 36 and continue with: 366 / 80

On to step 5:
80 goes into 366 4 times with a remainder of 46.
Record the quotient 4 as the next digit in the result. 
Result so far: 834.0
If we take 320 away from 366, we end up with 46.
Include the next digit (8) from the dividend after 46, then repeat: 468 / 80

Step 6:
If we divide 468 by 80, we get 5 and a remainder of 68.
Record the quotient 5 as the next digit in the result. 
Result so far: 8345.0
The remainder is 68 after subtracting 400 from 468.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Going ahead to step 7:
80 goes into 680 8 times with a remainder of 40.
The next digit of our result is 8. 
Result so far: 8345.8
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.

Let's proceed to step 8:
The number 80 fits into 400 5 times, leaving a remainder of 0.
The next digit of our result is 5. 
Result so far: 8345.85
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.

Advancing to step 9:
If we divide 0 by 80, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 8345.85
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.

On to step 10:
0 divided by 80 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 8345.85
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.

Our division results in 8345.85 with a remaining 0.0.