We look at the division of 78380955 by 909 
The aim is to understand the frequency of 909 in 78380955.

Going ahead to step 1:
If we divide 7 by 909, we get 0 and a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 909

Moving on to step 2:
The number 909 fits into 78 0 times, leaving a remainder of 78.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 78 to get 78.
Append the next digit (3) from the dividend to 78 and continue with: 783 / 909

Let's proceed to step 3:
When dividing 783 by 909, we get 0 with a remainder of 783.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 783 after subtracting 0 from 783.
Grab the next digit (8) from the dividend, add it to 783, then carry on: 7838 / 909

Advancing to step 4:
If we divide 7838 by 909, we get 8 and a remainder of 566.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Subtracting 7272 from 7838 leaves us with 566.
Grab the next digit (0) from the dividend, add it to 566, then carry on: 5660 / 909

Moving on to step 5:
If we divide 5660 by 909, we get 6 and a remainder of 206.
The number 6 becomes the next digit in our result. 
Result so far: 86.0
If we subtract 5454 from 5660, we get 206.
Bring next digit (9) of the dividend behind the 206 and repeat the process: 2069 / 909

Advancing to step 6:
If we divide 2069 by 909, we get 2 and a remainder of 251.
Use 2 as the next digit of our solution. 
Result so far: 862.0
If we take 1818 away from 2069, we end up with 251.
Bring next digit (5) of the dividend behind the 251 and repeat the process: 2515 / 909

On to step 7:
The number 909 fits into 2515 2 times, leaving a remainder of 697.
Use 2 as the next digit of our solution. 
Result so far: 8622.0
The remainder is 697 after subtracting 1818 from 2515.
Grab the next digit (5) from the dividend, add it to 697, then carry on: 6975 / 909

On to step 8:
The number 909 fits into 6975 7 times, leaving a remainder of 612.
Put 7 as the next digit of the answer. 
Result so far: 86227.0
If we subtract 6363 from 6975, we get 612.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6120, and continue the process.

Going ahead to step 9:
909 goes into 6120 6 times with a remainder of 666.
The number 6 becomes the next digit in our result. 
Result so far: 86227.6
The remainder is 666 after subtracting 5454 from 6120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6660, and continue the process.

Step 10:
The number 909 fits into 6660 7 times, leaving a remainder of 297.
The next digit of our result is 7. 
Result so far: 86227.67
Deduct 6363 from 6660 and we're left with 297.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

Moving on to step 11:
909 can be fit into 2970 3 times, resulting in a remainder of 243.
Record the quotient 3 as the next digit in the result. 
Result so far: 86227.673
If we take 2727 away from 2970, we end up with 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

On to step 12:
2430 divided by 909 is 2 with a remainder of 612.
The number 2 becomes the next digit in our result. 
Result so far: 86227.6732
Subtract 1818 from 2430 to get 612.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6120, and continue the process.

Advancing to step 13:
909 goes into 6120 6 times with a remainder of 666.
The number 6 becomes the next digit in our result. 
Result so far: 86227.67326
The remainder is 666 after subtracting 5454 from 6120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6660, and continue the process.

Let's proceed to step 14:
When dividing 6660 by 909, we get 7 with a remainder of 297.
Write down 7 as next digit of the result. 
Result so far: 86227.673267
Deduct 6363 from 6660 and we're left with 297.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

On to step 15:
909 can be fit into 2970 3 times, resulting in a remainder of 243.
Use 3 as the next digit of our solution. 
Result so far: 86227.6732673
Deduct 2727 from 2970 and we're left with 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

Moving on to step 16:
The number 909 fits into 2430 2 times, leaving a remainder of 612.
The next digit of our result is 2. 
Result so far: 86227.67326732
If we subtract 1818 from 2430, we get 612.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6120, and continue the process.

The final result is 86227.67326732 with a remainder of 6.12e-07.