We look at the division of 239700 by 81 
The aim is to understand the frequency of 81 in 239700.

Step 1:
The number 81 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 81

Step 2:
81 can be fit into 23 0 times, resulting in a remainder of 23.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 23, we end up with 23.
Fetch the next digit (9) from the dividend, attach it to 23 and continue: 239 / 81

Advancing to step 3:
81 goes into 239 2 times with a remainder of 77.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 162 from 239 leaves us with 77.
Bring next digit (7) of the dividend behind the 77 and repeat the process: 777 / 81

Moving on to step 4:
777 divided by 81 is 9 with a remainder of 48.
Record the quotient 9 as the next digit in the result. 
Result so far: 29.0
Subtract 729 from 777 to get 48.
Bring next digit (0) of the dividend behind the 48 and repeat the process: 480 / 81

Advancing to step 5:
When dividing 480 by 81, we get 5 with a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 295.0
If we take 405 away from 480, we end up with 75.
Include the next digit (0) from the dividend after 75, then repeat: 750 / 81

Advancing to step 6:
81 goes into 750 9 times with a remainder of 21.
Record the quotient 9 as the next digit in the result. 
Result so far: 2959.0
Subtracting 729 from 750 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 7:
81 can be fit into 210 2 times, resulting in a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 2959.2
If we subtract 162 from 210, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 8:
81 goes into 480 5 times with a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 2959.25
Subtracting 405 from 480 leaves us with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Going ahead to step 9:
When dividing 750 by 81, we get 9 with a remainder of 21.
The next digit of our result is 9. 
Result so far: 2959.259
Subtract 729 from 750 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Let's proceed to step 10:
81 goes into 210 2 times with a remainder of 48.
The next digit of our result is 2. 
Result so far: 2959.2592
Deduct 162 from 210 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 11:
When dividing 480 by 81, we get 5 with a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 2959.25925
Deduct 405 from 480 and we're left with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Step 12:
750 divided by 81 is 9 with a remainder of 21.
Record the quotient 9 as the next digit in the result. 
Result so far: 2959.259259
The remainder is 21 after subtracting 729 from 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 13:
81 can be fit into 210 2 times, resulting in a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 2959.2592592
If we subtract 162 from 210, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 14:
The number 81 fits into 480 5 times, leaving a remainder of 75.
The number 5 becomes the next digit in our result. 
Result so far: 2959.25925925
If we take 405 away from 480, we end up with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

After the division, we end up with 2959.25925925 and a remainder of 7.5e-08.