We look at the division of 99408765 by 80 
The aim is to understand the frequency of 80 in 99408765.

Going ahead to step 1:
When dividing 9 by 80, we get 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 80

Let's proceed to step 2:
If we divide 99 by 80, we get 1 and a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 80 from 99 and we're left with 19.
Include the next digit (4) from the dividend after 19, then repeat: 194 / 80

Let's proceed to step 3:
If we divide 194 by 80, we get 2 and a remainder of 34.
Write down 2 as next digit of the result. 
Result so far: 12.0
Deduct 160 from 194 and we're left with 34.
Grab the next digit (0) from the dividend, add it to 34, then carry on: 340 / 80

Moving on to step 4:
The number 80 fits into 340 4 times, leaving a remainder of 20.
Put 4 as the next digit of the answer. 
Result so far: 124.0
The remainder is 20 after subtracting 320 from 340.
Grab the next digit (8) from the dividend, add it to 20, then carry on: 208 / 80

Advancing to step 5:
208 divided by 80 is 2 with a remainder of 48.
Write down 2 as next digit of the result. 
Result so far: 1242.0
The remainder is 48 after subtracting 160 from 208.
Append the next digit (7) from the dividend to 48 and continue with: 487 / 80

Advancing to step 6:
80 can be fit into 487 6 times, resulting in a remainder of 7.
Put 6 as the next digit of the answer. 
Result so far: 12426.0
Deduct 480 from 487 and we're left with 7.
Take the next digit (6) from the dividend and append it to 7, then repeat: 76 / 80

Going ahead to step 7:
76 divided by 80 is 0 with a remainder of 76.
Put 0 as the next digit of the answer. 
Result so far: 124260.0
The remainder is 76 after subtracting 0 from 76.
Bring next digit (5) of the dividend behind the 76 and repeat the process: 765 / 80

On to step 8:
When dividing 765 by 80, we get 9 with a remainder of 45.
Put 9 as the next digit of the answer. 
Result so far: 1242609.0
Deduct 720 from 765 and we're left with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 9:
The number 80 fits into 450 5 times, leaving a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 1242609.5
Subtracting 400 from 450 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 10:
The number 80 fits into 500 6 times, leaving a remainder of 20.
Write down 6 as next digit of the result. 
Result so far: 1242609.56
The remainder is 20 after subtracting 480 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 11:
When dividing 200 by 80, we get 2 with a remainder of 40.
Record the quotient 2 as the next digit in the result. 
Result so far: 1242609.562
Subtracting 160 from 200 leaves us 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.

Moving on to step 12:
400 divided by 80 is 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 1242609.5625
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.

Going ahead to step 13:
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: 1242609.5625
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.

Advancing to step 14:
When dividing 0 by 80, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 1242609.5625
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.

The quotient of the division is 1242609.5625, and the remainder is 0.0.