81020404 ÷ 366 
The aim is to understand the frequency of 366 in 81020404.

Going ahead to step 1:
8 divided by 366 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 366

Moving on to step 2:
366 can be fit into 81 0 times, resulting in a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 81, we end up with 81.
Grab the next digit (0) from the dividend, add it to 81, then carry on: 810 / 366

Let's proceed to step 3:
The number 366 fits into 810 2 times, leaving a remainder of 78.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 732 from 810 and we're left with 78.
Include the next digit (2) from the dividend after 78, then repeat: 782 / 366

Step 4:
782 divided by 366 is 2 with a remainder of 50.
Use 2 as the next digit of our solution. 
Result so far: 22.0
Deduct 732 from 782 and we're left with 50.
Take the next digit (0) from the dividend and append it to 50, then repeat: 500 / 366

Going ahead to step 5:
The number 366 fits into 500 1 times, leaving a remainder of 134.
Write down 1 as next digit of the result. 
Result so far: 221.0
The remainder is 134 after subtracting 366 from 500.
Include the next digit (4) from the dividend after 134, then repeat: 1344 / 366

Step 6:
1344 divided by 366 is 3 with a remainder of 246.
The next digit of our result is 3. 
Result so far: 2213.0
If we subtract 1098 from 1344, we get 246.
Take the next digit (0) from the dividend and append it to 246, then repeat: 2460 / 366

On to step 7:
2460 divided by 366 is 6 with a remainder of 264.
Put 6 as the next digit of the answer. 
Result so far: 22136.0
The remainder is 264 after subtracting 2196 from 2460.
Grab the next digit (4) from the dividend, add it to 264, then carry on: 2644 / 366

Step 8:
If we divide 2644 by 366, we get 7 and a remainder of 82.
Use 7 as the next digit of our solution. 
Result so far: 221367.0
The remainder is 82 after subtracting 2562 from 2644.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Step 9:
820 divided by 366 is 2 with a remainder of 88.
Put 2 as the next digit of the answer. 
Result so far: 221367.2
If we subtract 732 from 820, we get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Advancing to step 10:
366 goes into 880 2 times with a remainder of 148.
Record the quotient 2 as the next digit in the result. 
Result so far: 221367.22
Subtracting 732 from 880 leaves us with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

The final result is 221367.22 with a remainder of 0.148.