369069 ÷ 81 
The aim is to understand the frequency of 81 in 369069.

Step 1:
When dividing 3 by 81, we get 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 81

Advancing to step 2:
36 divided by 81 is 0 with a remainder of 36.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 36, we end up with 36.
Bring next digit (9) of the dividend behind the 36 and repeat the process: 369 / 81

Advancing to step 3:
If we divide 369 by 81, we get 4 and a remainder of 45.
The next digit of our result is 4. 
Result so far: 4.0
The remainder is 45 after subtracting 324 from 369.
Take the next digit (0) from the dividend and append it to 45, then repeat: 450 / 81

Moving on to step 4:
81 can be fit into 450 5 times, resulting in a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 45.0
The remainder is 45 after subtracting 405 from 450.
Append the next digit (6) from the dividend to 45 and continue with: 456 / 81

Going ahead to step 5:
456 divided by 81 is 5 with a remainder of 51.
Record the quotient 5 as the next digit in the result. 
Result so far: 455.0
If we take 405 away from 456, we end up with 51.
Append the next digit (9) from the dividend to 51 and continue with: 519 / 81

Step 6:
519 divided by 81 is 6 with a remainder of 33.
Use 6 as the next digit of our solution. 
Result so far: 4556.0
Subtracting 486 from 519 leaves us with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Moving on to step 7:
81 can be fit into 330 4 times, resulting in a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 4556.4
The remainder is 6 after subtracting 324 from 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 8:
60 divided by 81 is 0 with a remainder of 60.
The next digit of our result is 0. 
Result so far: 4556.4
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 9:
The number 81 fits into 600 7 times, leaving a remainder of 33.
Write down 7 as next digit of the result. 
Result so far: 4556.407
If we subtract 567 from 600, we get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Let's proceed to step 10:
330 divided by 81 is 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 4556.4074
Subtracting 324 from 330 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 11:
60 divided by 81 is 0 with a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 4556.4074
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 12:
600 divided by 81 is 7 with a remainder of 33.
Write down 7 as next digit of the result. 
Result so far: 4556.407407
Subtracting 567 from 600 leaves us with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Moving on to step 13:
330 divided by 81 is 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 4556.4074074
Subtract 324 from 330 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 14:
81 goes into 60 0 times with a remainder of 60.
The next digit of our result is 0. 
Result so far: 4556.4074074
Subtracting 0 from 60 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

After the division, we end up with 4556.4074074 and a remainder of 6e-08.