263600 divided by 81 
The aim is to understand the frequency of 81 in 263600.

Let's proceed to step 1:
If we divide 2 by 81, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Bring next digit (6) of the dividend behind the 2 and repeat the process: 26 / 81

Moving on to step 2:
The number 81 fits into 26 0 times, leaving a remainder of 26.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 26 and we're left with 26.
Take the next digit (3) from the dividend and append it to 26, then repeat: 263 / 81

Advancing to step 3:
263 divided by 81 is 3 with a remainder of 20.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 243 away from 263, we end up with 20.
Fetch the next digit (6) from the dividend, attach it to 20 and continue: 206 / 81

Moving on to step 4:
206 divided by 81 is 2 with a remainder of 44.
Put 2 as the next digit of the answer. 
Result so far: 32.0
Deduct 162 from 206 and we're left with 44.
Bring next digit (0) of the dividend behind the 44 and repeat the process: 440 / 81

Moving on to step 5:
When dividing 440 by 81, we get 5 with a remainder of 35.
The number 5 becomes the next digit in our result. 
Result so far: 325.0
The remainder is 35 after subtracting 405 from 440.
Bring next digit (0) of the dividend behind the 35 and repeat the process: 350 / 81

Moving on to step 6:
350 divided by 81 is 4 with a remainder of 26.
Record the quotient 4 as the next digit in the result. 
Result so far: 3254.0
If we subtract 324 from 350, we 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 7:
81 goes into 260 3 times with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 3254.3
The remainder is 17 after subtracting 243 from 260.
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 8:
81 can be fit into 170 2 times, resulting in a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 3254.32
If we subtract 162 from 170, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 9:
80 divided by 81 is 0 with a remainder of 80.
The next digit of our result is 0. 
Result so far: 3254.32
Deduct 0 from 80 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 10:
800 divided by 81 is 9 with a remainder of 71.
Use 9 as the next digit of our solution. 
Result so far: 3254.3209
If we subtract 729 from 800, we get 71.
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 11:
If we divide 710 by 81, we get 8 and a remainder of 62.
Record the quotient 8 as the next digit in the result. 
Result so far: 3254.32098
Subtract 648 from 710 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Let's proceed to step 12:
The number 81 fits into 620 7 times, leaving a remainder of 53.
Put 7 as the next digit of the answer. 
Result so far: 3254.320987
Subtract 567 from 620 to get 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 13:
81 goes into 530 6 times with a remainder of 44.
The next digit of our result is 6. 
Result so far: 3254.3209876
The remainder is 44 after subtracting 486 from 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 14:
440 divided by 81 is 5 with a remainder of 35.
Use 5 as the next digit of our solution. 
Result so far: 3254.32098765
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.

The final outcome is 3254.32098765, with a leftover of 3.5e-08.