We're dividing 815816 by 80 
The aim is to understand the frequency of 80 in 815816.

Moving on to step 1:
80 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 80

Going ahead to step 2:
If we divide 81 by 80, we get 1 and a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 80 from 81 to get 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 80

Let's proceed to step 3:
80 goes into 15 0 times with a remainder of 15.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 15, we get 15.
Append the next digit (8) from the dividend to 15 and continue with: 158 / 80

Step 4:
The number 80 fits into 158 1 times, leaving a remainder of 78.
Use 1 as the next digit of our solution. 
Result so far: 101.0
Subtracting 80 from 158 leaves us with 78.
Fetch the next digit (1) from the dividend, attach it to 78 and continue: 781 / 80

Moving on to step 5:
80 goes into 781 9 times with a remainder of 61.
Use 9 as the next digit of our solution. 
Result so far: 1019.0
Subtracting 720 from 781 leaves us with 61.
Include the next digit (6) from the dividend after 61, then repeat: 616 / 80

Advancing to step 6:
80 goes into 616 7 times with a remainder of 56.
Write down 7 as next digit of the result. 
Result so far: 10197.0
If we take 560 away from 616, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 7:
560 divided by 80 is 7 with a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 10197.7
The remainder is 0 after subtracting 560 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
The number 80 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 10197.7
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.

Advancing to step 9:
When dividing 0 by 80, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 10197.7
The remainder is 0 after subtracting 0 from 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 quotient of the division is 10197.7, and the remainder is 0.0.