191921 divided by 80 
The aim is to understand the frequency of 80 in 191921.

Going ahead to step 1:
1 divided by 80 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 80

Step 2:
19 divided by 80 is 0 with a remainder of 19.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 19 after subtracting 0 from 19.
Include the next digit (1) from the dividend after 19, then repeat: 191 / 80

Going ahead to step 3:
If we divide 191 by 80, we get 2 and a remainder of 31.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 160 from 191, we get 31.
Append the next digit (9) from the dividend to 31 and continue with: 319 / 80

Moving on to step 4:
If we divide 319 by 80, we get 3 and a remainder of 79.
Put 3 as the next digit of the answer. 
Result so far: 23.0
Subtracting 240 from 319 leaves us with 79.
Bring next digit (2) of the dividend behind the 79 and repeat the process: 792 / 80

Going ahead to step 5:
792 divided by 80 is 9 with a remainder of 72.
Write down 9 as next digit of the result. 
Result so far: 239.0
The remainder is 72 after subtracting 720 from 792.
Include the next digit (1) from the dividend after 72, then repeat: 721 / 80

Moving on to step 6:
80 can be fit into 721 9 times, resulting in a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 2399.0
If we take 720 away from 721, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 7:
The number 80 fits into 10 0 times, leaving a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 2399.0
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
If we divide 100 by 80, we get 1 and a remainder of 20.
Use 1 as the next digit of our solution. 
Result so far: 2399.01
The remainder is 20 after subtracting 80 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 9:
When dividing 200 by 80, we get 2 with a remainder of 40.
The next digit of our result is 2. 
Result so far: 2399.012
The remainder is 40 after subtracting 160 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 10:
80 can be fit into 400 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 2399.0125
Subtract 400 from 400 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.

Let's proceed to step 11:
The number 80 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 2399.0125
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.

On to step 12:
When dividing 0 by 80, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 2399.0125
If we take 0 away from 0, we end up 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 quotient of the division is 2399.0125, and the remainder is 0.0.