We look at the division of 663695 by 80 
The aim is to understand the frequency of 80 in 663695.

Advancing to step 1:
6 divided by 80 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 80

Step 2:
66 divided by 80 is 0 with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Bring next digit (3) of the dividend behind the 66 and repeat the process: 663 / 80

Advancing to step 3:
80 goes into 663 8 times with a remainder of 23.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtracting 640 from 663 leaves us with 23.
Take the next digit (6) from the dividend and append it to 23, then repeat: 236 / 80

Moving on to step 4:
If we divide 236 by 80, we get 2 and a remainder of 76.
Write down 2 as next digit of the result. 
Result so far: 82.0
Deduct 160 from 236 and we're left with 76.
Bring next digit (9) of the dividend behind the 76 and repeat the process: 769 / 80

Advancing to step 5:
80 goes into 769 9 times with a remainder of 49.
Record the quotient 9 as the next digit in the result. 
Result so far: 829.0
Subtract 720 from 769 to get 49.
Fetch the next digit (5) from the dividend, attach it to 49 and continue: 495 / 80

Moving on to step 6:
495 divided by 80 is 6 with a remainder of 15.
The next digit of our result is 6. 
Result so far: 8296.0
Deduct 480 from 495 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 7:
80 can be fit into 150 1 times, resulting in a remainder of 70.
The number 1 becomes the next digit in our result. 
Result so far: 8296.1
Subtract 80 from 150 to 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.

On to step 8:
The number 80 fits into 700 8 times, leaving a remainder of 60.
Put 8 as the next digit of the answer. 
Result so far: 8296.18
Deduct 640 from 700 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.

Advancing to step 9:
The number 80 fits into 600 7 times, leaving a remainder of 40.
The number 7 becomes the next digit in our result. 
Result so far: 8296.187
If we subtract 560 from 600, 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.

Going ahead to step 10:
The number 80 fits into 400 5 times, leaving a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 8296.1875
If we subtract 400 from 400, 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 11:
When dividing 0 by 80, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 8296.1875
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.

Step 12:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 8296.1875
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.

The final result is 8296.1875 with a remainder of 0.0.