We look at the division of 791486 by 80 
The aim is to understand the frequency of 80 in 791486.

Step 1:
If we divide 7 by 80, we get 0 and a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Append the next digit (9) from the dividend to 7 and continue with: 79 / 80

On to step 2:
The number 80 fits into 79 0 times, leaving a remainder of 79.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 79 to get 79.
Grab the next digit (1) from the dividend, add it to 79, then carry on: 791 / 80

Step 3:
80 goes into 791 9 times with a remainder of 71.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtracting 720 from 791 leaves us with 71.
Take the next digit (4) from the dividend and append it to 71, then repeat: 714 / 80

Going ahead to step 4:
80 can be fit into 714 8 times, resulting in a remainder of 74.
The next digit of our result is 8. 
Result so far: 98.0
Subtracting 640 from 714 leaves us with 74.
Bring next digit (8) of the dividend behind the 74 and repeat the process: 748 / 80

Moving on to step 5:
The number 80 fits into 748 9 times, leaving a remainder of 28.
Record the quotient 9 as the next digit in the result. 
Result so far: 989.0
Subtract 720 from 748 to get 28.
Include the next digit (6) from the dividend after 28, then repeat: 286 / 80

Step 6:
The number 80 fits into 286 3 times, leaving a remainder of 46.
The next digit of our result is 3. 
Result so far: 9893.0
Subtract 240 from 286 to get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Advancing to step 7:
80 goes into 460 5 times with a remainder of 60.
The number 5 becomes the next digit in our result. 
Result so far: 9893.5
Deduct 400 from 460 and we're left 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.

Going ahead to step 8:
80 can be fit into 600 7 times, resulting in a remainder of 40.
Record the quotient 7 as the next digit in the result. 
Result so far: 9893.57
Deduct 560 from 600 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 9:
When dividing 400 by 80, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 9893.575
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.

Step 10:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 9893.575
Subtracting 0 from 0 leaves us 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.

Let's proceed to step 11:
80 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 9893.575
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 result is 9893.575 with a remainder of 0.0.