We divide 115397 by 81
The aim is to understand the frequency of 81 in 115397.

Going ahead to step 1:
81 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 81

Advancing to step 2:
When dividing 11 by 81, we get 0 with a remainder of 11.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 11 to get 11.
Take the next digit (5) from the dividend and append it to 11, then repeat: 115 / 81

Step 3:
81 goes into 115 1 times with a remainder of 34.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 81 away from 115, we end up with 34.
Include the next digit (3) from the dividend after 34, then repeat: 343 / 81

Going ahead to step 4:
81 can be fit into 343 4 times, resulting in a remainder of 19.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
Subtract 324 from 343 to get 19.
Grab the next digit (9) from the dividend, add it to 19, then carry on: 199 / 81

Moving on to step 5:
When dividing 199 by 81, we get 2 with a remainder of 37.
The next digit of our result is 2. 
Result so far: 142.0
Subtracting 162 from 199 leaves us with 37.
Take the next digit (7) from the dividend and append it to 37, then repeat: 377 / 81

Moving on to step 6:
When dividing 377 by 81, we get 4 with a remainder of 53.
The number 4 becomes the next digit in our result. 
Result so far: 1424.0
The remainder is 53 after subtracting 324 from 377.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Let's proceed to step 7:
The number 81 fits into 530 6 times, leaving a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 1424.6
If we take 486 away from 530, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 8:
The number 81 fits into 440 5 times, leaving a remainder of 35.
The next digit of our result is 5. 
Result so far: 1424.65
Subtracting 405 from 440 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 9:
81 goes into 350 4 times with a remainder of 26.
Record the quotient 4 as the next digit in the result. 
Result so far: 1424.654
If we take 324 away from 350, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 10:
When dividing 260 by 81, we get 3 with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 1424.6543
Deduct 243 from 260 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 11:
170 divided by 81 is 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 1424.65432
Deduct 162 from 170 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 12:
If we divide 80 by 81, we get 0 and a remainder of 80.
Record the quotient 0 as the next digit in the result. 
Result so far: 1424.65432
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 13:
81 goes into 800 9 times with a remainder of 71.
The number 9 becomes the next digit in our result. 
Result so far: 1424.6543209
Subtracting 729 from 800 leaves us with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

On to step 14:
81 goes into 710 8 times with a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 1424.65432098
If we take 648 away from 710, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

After the division, we end up with 1424.65432098 and a remainder of 6.2e-08.