715381 divided by 81 
The aim is to understand the frequency of 81 in 715381.

Advancing to step 1:
81 can be fit into 7 0 times, resulting in a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Grab the next digit (1) from the dividend, add it to 7, then carry on: 71 / 81

On to step 2:
When dividing 71 by 81, we get 0 with a remainder of 71.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 71 leaves us with 71.
Append the next digit (5) from the dividend to 71 and continue with: 715 / 81

Let's proceed to step 3:
81 goes into 715 8 times with a remainder of 67.
Write down 8 as next digit of the result. 
Result so far: 8.0
Deduct 648 from 715 and we're left with 67.
Fetch the next digit (3) from the dividend, attach it to 67 and continue: 673 / 81

Moving on to step 4:
673 divided by 81 is 8 with a remainder of 25.
The next digit of our result is 8. 
Result so far: 88.0
The remainder is 25 after subtracting 648 from 673.
Take the next digit (8) from the dividend and append it to 25, then repeat: 258 / 81

Step 5:
258 divided by 81 is 3 with a remainder of 15.
The number 3 becomes the next digit in our result. 
Result so far: 883.0
Subtracting 243 from 258 leaves us with 15.
Append the next digit (1) from the dividend to 15 and continue with: 151 / 81

Going ahead to step 6:
151 divided by 81 is 1 with a remainder of 70.
Put 1 as the next digit of the answer. 
Result so far: 8831.0
Subtracting 81 from 151 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 7:
81 goes into 700 8 times with a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 8831.8
Subtract 648 from 700 to get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 8:
The number 81 fits into 520 6 times, leaving a remainder of 34.
Record the quotient 6 as the next digit in the result. 
Result so far: 8831.86
Deduct 486 from 520 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 9:
If we divide 340 by 81, we get 4 and a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 8831.864
If we take 324 away from 340, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 10:
81 goes into 160 1 times with a remainder of 79.
The next digit of our result is 1. 
Result so far: 8831.8641
Subtracting 81 from 160 leaves us with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Advancing to step 11:
If we divide 790 by 81, we get 9 and a remainder of 61.
Record the quotient 9 as the next digit in the result. 
Result so far: 8831.86419
If we subtract 729 from 790, we get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Step 12:
81 goes into 610 7 times with a remainder of 43.
Use 7 as the next digit of our solution. 
Result so far: 8831.864197
Subtract 567 from 610 to get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Moving on to step 13:
430 divided by 81 is 5 with a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 8831.8641975
If we take 405 away from 430, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 14:
250 divided by 81 is 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 8831.86419753
Deduct 243 from 250 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Our division results in 8831.86419753 with a remaining 7e-09.