We're dividing 384090 by 81 
The aim is to understand the frequency of 81 in 384090.

On to step 1:
81 goes into 3 0 times with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 81

Let's proceed to step 2:
When dividing 38 by 81, we get 0 with a remainder of 38.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 38 to get 38.
Include the next digit (4) from the dividend after 38, then repeat: 384 / 81

Step 3:
The number 81 fits into 384 4 times, leaving a remainder of 60.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we subtract 324 from 384, we get 60.
Grab the next digit (0) from the dividend, add it to 60, then carry on: 600 / 81

Moving on to step 4:
When dividing 600 by 81, we get 7 with a remainder of 33.
The number 7 becomes the next digit in our result. 
Result so far: 47.0
Subtract 567 from 600 to get 33.
Grab the next digit (9) from the dividend, add it to 33, then carry on: 339 / 81

On to step 5:
81 can be fit into 339 4 times, resulting in a remainder of 15.
The number 4 becomes the next digit in our result. 
Result so far: 474.0
The remainder is 15 after subtracting 324 from 339.
Bring next digit (0) of the dividend behind the 15 and repeat the process: 150 / 81

Moving on to step 6:
When dividing 150 by 81, we get 1 with a remainder of 69.
The next digit of our result is 1. 
Result so far: 4741.0
If we take 81 away from 150, 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:
When dividing 690 by 81, we get 8 with a remainder of 42.
The next digit of our result is 8. 
Result so far: 4741.8
If we take 648 away from 690, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 8:
81 can be fit into 420 5 times, resulting in a remainder of 15.
The next digit of our result is 5. 
Result so far: 4741.85
Subtract 405 from 420 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 9:
150 divided by 81 is 1 with a remainder of 69.
Use 1 as the next digit of our solution. 
Result so far: 4741.851
Deduct 81 from 150 and we're left 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.

Let's proceed to step 10:
When dividing 690 by 81, we get 8 with a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 4741.8518
Subtract 648 from 690 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 11:
420 divided by 81 is 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 4741.85185
If we take 405 away from 420, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 12:
When dividing 150 by 81, we get 1 with a remainder of 69.
The next digit of our result is 1. 
Result so far: 4741.851851
Subtract 81 from 150 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

On to step 13:
81 goes into 690 8 times with a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 4741.8518518
Subtract 648 from 690 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 14:
If we divide 420 by 81, we get 5 and a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 4741.85185185
Subtracting 405 from 420 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 4741.85185185 with a remainder of 1.5e-08.