191878 ÷ 20 
The aim is to understand the frequency of 20 in 191878.

Let's proceed to step 1:
When dividing 1 by 20, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our 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 / 20

Advancing to step 2:
The number 20 fits into 19 0 times, leaving a remainder of 19.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 19 leaves us with 19.
Append the next digit (1) from the dividend to 19 and continue with: 191 / 20

On to step 3:
If we divide 191 by 20, we get 9 and a remainder of 11.
The next digit of our result is 9. 
Result so far: 9.0
If we subtract 180 from 191, we get 11.
Take the next digit (8) from the dividend and append it to 11, then repeat: 118 / 20

Advancing to step 4:
20 can be fit into 118 5 times, resulting in a remainder of 18.
Use 5 as the next digit of our solution. 
Result so far: 95.0
If we subtract 100 from 118, we get 18.
Include the next digit (7) from the dividend after 18, then repeat: 187 / 20

Step 5:
20 goes into 187 9 times with a remainder of 7.
Use 9 as the next digit of our solution. 
Result so far: 959.0
The remainder is 7 after subtracting 180 from 187.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 20

Step 6:
20 can be fit into 78 3 times, resulting in a remainder of 18.
Write down 3 as next digit of the result. 
Result so far: 9593.0
The remainder is 18 after subtracting 60 from 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 7:
If we divide 180 by 20, we get 9 and a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 9593.9
The remainder is 0 after subtracting 180 from 180.
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 8:
20 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 9593.9
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 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 9593.9
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 final outcome is 9593.9, with a leftover of 0.0.