304158 divided by 91 
The aim is to understand the frequency of 91 in 304158.

Going ahead to step 1:
If we divide 3 by 91, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Fetch the next digit (0) from the dividend, attach it to 3 and continue: 30 / 91

Let's proceed to step 2:
91 goes into 30 0 times with a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 30 leaves us with 30.
Fetch the next digit (4) from the dividend, attach it to 30 and continue: 304 / 91

Step 3:
304 divided by 91 is 3 with a remainder of 31.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtracting 273 from 304 leaves us with 31.
Append the next digit (1) from the dividend to 31 and continue with: 311 / 91

Moving on to step 4:
The number 91 fits into 311 3 times, leaving a remainder of 38.
The next digit of our result is 3. 
Result so far: 33.0
If we take 273 away from 311, we end up with 38.
Bring next digit (5) of the dividend behind the 38 and repeat the process: 385 / 91

Advancing to step 5:
If we divide 385 by 91, we get 4 and a remainder of 21.
Record the quotient 4 as the next digit in the result. 
Result so far: 334.0
Subtract 364 from 385 to get 21.
Bring next digit (8) of the dividend behind the 21 and repeat the process: 218 / 91

Advancing to step 6:
91 can be fit into 218 2 times, resulting in a remainder of 36.
Use 2 as the next digit of our solution. 
Result so far: 3342.0
Deduct 182 from 218 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 7:
If we divide 360 by 91, we get 3 and a remainder of 87.
Use 3 as the next digit of our solution. 
Result so far: 3342.3
Deduct 273 from 360 and we're left with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Going ahead to step 8:
91 goes into 870 9 times with a remainder of 51.
Put 9 as the next digit of the answer. 
Result so far: 3342.39
If we take 819 away from 870, we end up with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Moving on to step 9:
When dividing 510 by 91, we get 5 with a remainder of 55.
Use 5 as the next digit of our solution. 
Result so far: 3342.395
If we take 455 away from 510, we end up with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

On to step 10:
550 divided by 91 is 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 3342.3956
If we take 546 away from 550, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 11:
40 divided by 91 is 0 with a remainder of 40.
The next digit of our result is 0. 
Result so far: 3342.3956
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 12:
When dividing 400 by 91, we get 4 with a remainder of 36.
Put 4 as the next digit of the answer. 
Result so far: 3342.395604
If we take 364 away from 400, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 13:
The number 91 fits into 360 3 times, leaving a remainder of 87.
Use 3 as the next digit of our solution. 
Result so far: 3342.3956043
The remainder is 87 after subtracting 273 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

On to step 14:
870 divided by 91 is 9 with a remainder of 51.
Put 9 as the next digit of the answer. 
Result so far: 3342.39560439
The remainder is 51 after subtracting 819 from 870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

The final result is 3342.39560439 with a remainder of 5.1e-08.