We're dividing 679945 by 81 
The aim is to understand the frequency of 81 in 679945.

Step 1:
81 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (7) from the dividend to 6 and continue with: 67 / 81

Advancing to step 2:
81 goes into 67 0 times with a remainder of 67.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 67 after subtracting 0 from 67.
Bring next digit (9) of the dividend behind the 67 and repeat the process: 679 / 81

Moving on to step 3:
81 goes into 679 8 times with a remainder of 31.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtracting 648 from 679 leaves us with 31.
Include the next digit (9) from the dividend after 31, then repeat: 319 / 81

Going ahead to step 4:
319 divided by 81 is 3 with a remainder of 76.
The next digit of our result is 3. 
Result so far: 83.0
Subtract 243 from 319 to get 76.
Grab the next digit (4) from the dividend, add it to 76, then carry on: 764 / 81

Step 5:
When dividing 764 by 81, we get 9 with a remainder of 35.
The next digit of our result is 9. 
Result so far: 839.0
Subtract 729 from 764 to get 35.
Include the next digit (5) from the dividend after 35, then repeat: 355 / 81

Let's proceed to step 6:
81 goes into 355 4 times with a remainder of 31.
The number 4 becomes the next digit in our result. 
Result so far: 8394.0
If we take 324 away from 355, we end up with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Going ahead to step 7:
310 divided by 81 is 3 with a remainder of 67.
Write down 3 as next digit of the result. 
Result so far: 8394.3
Subtract 243 from 310 to get 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

On to step 8:
The number 81 fits into 670 8 times, leaving a remainder of 22.
The next digit of our result is 8. 
Result so far: 8394.38
Deduct 648 from 670 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Let's proceed to step 9:
If we divide 220 by 81, we get 2 and a remainder of 58.
The next digit of our result is 2. 
Result so far: 8394.382
If we subtract 162 from 220, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 10:
81 goes into 580 7 times with a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 8394.3827
Deduct 567 from 580 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 11:
If we divide 130 by 81, we get 1 and a remainder of 49.
Write down 1 as next digit of the result. 
Result so far: 8394.38271
Deduct 81 from 130 and we're left with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

On to step 12:
The number 81 fits into 490 6 times, leaving a remainder of 4.
The next digit of our result is 6. 
Result so far: 8394.382716
Subtract 486 from 490 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 13:
81 can be fit into 40 0 times, resulting in a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 8394.382716
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 14:
81 goes into 400 4 times with a remainder of 76.
The next digit of our result is 4. 
Result so far: 8394.38271604
If we take 324 away from 400, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

The final result is 8394.38271604 with a remainder of 7.6e-08.