We're dividing 175258 by 81 
The aim is to understand the frequency of 81 in 175258.

On to step 1:
When dividing 1 by 81, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 81

Going ahead to step 2:
If we divide 17 by 81, we get 0 and a remainder of 17.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 17 leaves us with 17.
Fetch the next digit (5) from the dividend, attach it to 17 and continue: 175 / 81

On to step 3:
If we divide 175 by 81, we get 2 and a remainder of 13.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 162 from 175 to get 13.
Bring next digit (2) of the dividend behind the 13 and repeat the process: 132 / 81

Going ahead to step 4:
If we divide 132 by 81, we get 1 and a remainder of 51.
Use 1 as the next digit of our solution. 
Result so far: 21.0
If we subtract 81 from 132, we get 51.
Fetch the next digit (5) from the dividend, attach it to 51 and continue: 515 / 81

Step 5:
81 goes into 515 6 times with a remainder of 29.
The next digit of our result is 6. 
Result so far: 216.0
The remainder is 29 after subtracting 486 from 515.
Take the next digit (8) from the dividend and append it to 29, then repeat: 298 / 81

Let's proceed to step 6:
81 can be fit into 298 3 times, resulting in a remainder of 55.
Write down 3 as next digit of the result. 
Result so far: 2163.0
Subtract 243 from 298 to get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Let's proceed to step 7:
550 divided by 81 is 6 with a remainder of 64.
Put 6 as the next digit of the answer. 
Result so far: 2163.6
If we take 486 away from 550, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 8:
The number 81 fits into 640 7 times, leaving a remainder of 73.
The number 7 becomes the next digit in our result. 
Result so far: 2163.67
The remainder is 73 after subtracting 567 from 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Advancing to step 9:
81 goes into 730 9 times with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 2163.679
The remainder is 1 after subtracting 729 from 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 10:
When dividing 10 by 81, we get 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 2163.679
If we subtract 0 from 10, we get 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 11:
The number 81 fits into 100 1 times, leaving a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 2163.67901
The remainder is 19 after subtracting 81 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 12:
81 can be fit into 190 2 times, resulting in a remainder of 28.
The next digit of our result is 2. 
Result so far: 2163.679012
Subtracting 162 from 190 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 13:
When dividing 280 by 81, we get 3 with a remainder of 37.
The number 3 becomes the next digit in our result. 
Result so far: 2163.6790123
Subtract 243 from 280 to get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 14:
81 goes into 370 4 times with a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 2163.67901234
Deduct 324 from 370 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

The final result is 2163.67901234 with a remainder of 4.6e-08.