Let's divide 991189 by 80
The aim is to understand the frequency of 80 in 991189.

Step 1:
The number 80 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 80

Moving on to step 2:
80 goes into 99 1 times with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 80 from 99 to get 19.
Take the next digit (1) from the dividend and append it to 19, then repeat: 191 / 80

Step 3:
191 divided by 80 is 2 with a remainder of 31.
The next digit of our result is 2. 
Result so far: 12.0
Subtracting 160 from 191 leaves us with 31.
Grab the next digit (1) from the dividend, add it to 31, then carry on: 311 / 80

Going ahead to step 4:
311 divided by 80 is 3 with a remainder of 71.
The next digit of our result is 3. 
Result so far: 123.0
If we subtract 240 from 311, we get 71.
Include the next digit (8) from the dividend after 71, then repeat: 718 / 80

Let's proceed to step 5:
When dividing 718 by 80, we get 8 with a remainder of 78.
Write down 8 as next digit of the result. 
Result so far: 1238.0
If we take 640 away from 718, we end up with 78.
Fetch the next digit (9) from the dividend, attach it to 78 and continue: 789 / 80

Going ahead to step 6:
If we divide 789 by 80, we get 9 and a remainder of 69.
Use 9 as the next digit of our solution. 
Result so far: 12389.0
If we take 720 away from 789, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Advancing to step 7:
80 can be fit into 690 8 times, resulting in a remainder of 50.
The number 8 becomes the next digit in our result. 
Result so far: 12389.8
Subtracting 640 from 690 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.

Going ahead to step 8:
The number 80 fits into 500 6 times, leaving a remainder of 20.
Record the quotient 6 as the next digit in the result. 
Result so far: 12389.86
Deduct 480 from 500 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 9:
The number 80 fits into 200 2 times, leaving a remainder of 40.
The next digit of our result is 2. 
Result so far: 12389.862
If we take 160 away from 200, we end up 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.

Step 10:
80 can be fit into 400 5 times, resulting in a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 12389.8625
Subtracting 400 from 400 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.

Advancing to step 11:
0 divided by 80 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 12389.8625
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.

Step 12:
80 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 12389.8625
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.

After the division, we end up with 12389.8625 and a remainder of 0.0.