791648 divided by 81 
The aim is to understand the frequency of 81 in 791648.

On to step 1:
81 goes into 7 0 times with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Grab the next digit (9) from the dividend, add it to 7, then carry on: 79 / 81

Advancing to step 2:
If we divide 79 by 81, we get 0 and a remainder of 79.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 79, we end up with 79.
Include the next digit (1) from the dividend after 79, then repeat: 791 / 81

Step 3:
The number 81 fits into 791 9 times, leaving a remainder of 62.
Use 9 as the next digit of our solution. 
Result so far: 9.0
If we take 729 away from 791, we end up with 62.
Take the next digit (6) from the dividend and append it to 62, then repeat: 626 / 81

Step 4:
The number 81 fits into 626 7 times, leaving a remainder of 59.
Write down 7 as next digit of the result. 
Result so far: 97.0
The remainder is 59 after subtracting 567 from 626.
Fetch the next digit (4) from the dividend, attach it to 59 and continue: 594 / 81

Step 5:
If we divide 594 by 81, we get 7 and a remainder of 27.
Record the quotient 7 as the next digit in the result. 
Result so far: 977.0
If we subtract 567 from 594, we get 27.
Bring next digit (8) of the dividend behind the 27 and repeat the process: 278 / 81

Let's proceed to step 6:
When dividing 278 by 81, we get 3 with a remainder of 35.
The next digit of our result is 3. 
Result so far: 9773.0
The remainder is 35 after subtracting 243 from 278.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Going ahead to step 7:
If we divide 350 by 81, we get 4 and a remainder of 26.
Write down 4 as next digit of the result. 
Result so far: 9773.4
Subtract 324 from 350 to get 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 8:
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: 9773.43
Subtracting 243 from 260 leaves us 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.

Advancing to step 9:
81 goes into 170 2 times with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 9773.432
Subtracting 162 from 170 leaves us 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.

Step 10:
81 can be fit into 80 0 times, resulting in a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 9773.432
Subtract 0 from 80 to 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.

Moving on to step 11:
If we divide 800 by 81, we get 9 and a remainder of 71.
Use 9 as the next digit of our solution. 
Result so far: 9773.43209
The remainder is 71 after subtracting 729 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Advancing to step 12:
When dividing 710 by 81, we get 8 with a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 9773.432098
The remainder is 62 after subtracting 648 from 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 13:
620 divided by 81 is 7 with a remainder of 53.
Put 7 as the next digit of the answer. 
Result so far: 9773.4320987
Subtracting 567 from 620 leaves us with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Advancing to step 14:
81 can be fit into 530 6 times, resulting in a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 9773.43209876
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.

After the division, we end up with 9773.43209876 and a remainder of 4.4e-08.