Let's divide 905406 by 91
The aim is to understand the frequency of 91 in 905406.

Advancing to step 1:
91 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 91

Let's proceed to step 2:
91 can be fit into 90 0 times, resulting in a remainder of 90.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 90, we get 90.
Bring next digit (5) of the dividend behind the 90 and repeat the process: 905 / 91

Moving on to step 3:
If we divide 905 by 91, we get 9 and a remainder of 86.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Deduct 819 from 905 and we're left with 86.
Fetch the next digit (4) from the dividend, attach it to 86 and continue: 864 / 91

Advancing to step 4:
When dividing 864 by 91, we get 9 with a remainder of 45.
Record the quotient 9 as the next digit in the result. 
Result so far: 99.0
Deduct 819 from 864 and we're left with 45.
Include the next digit (0) from the dividend after 45, then repeat: 450 / 91

Let's proceed to step 5:
The number 91 fits into 450 4 times, leaving a remainder of 86.
The next digit of our result is 4. 
Result so far: 994.0
The remainder is 86 after subtracting 364 from 450.
Append the next digit (6) from the dividend to 86 and continue with: 866 / 91

On to step 6:
866 divided by 91 is 9 with a remainder of 47.
Write down 9 as next digit of the result. 
Result so far: 9949.0
Deduct 819 from 866 and we're left with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Going ahead to step 7:
If we divide 470 by 91, we get 5 and a remainder of 15.
The next digit of our result is 5. 
Result so far: 9949.5
If we take 455 away from 470, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 8:
The number 91 fits into 150 1 times, leaving a remainder of 59.
The number 1 becomes the next digit in our result. 
Result so far: 9949.51
Subtract 91 from 150 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Going ahead to step 9:
91 can be fit into 590 6 times, resulting in a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 9949.516
Subtracting 546 from 590 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 10:
440 divided by 91 is 4 with a remainder of 76.
Record the quotient 4 as the next digit in the result. 
Result so far: 9949.5164
The remainder is 76 after subtracting 364 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Let's proceed to step 11:
If we divide 760 by 91, we get 8 and a remainder of 32.
The next digit of our result is 8. 
Result so far: 9949.51648
Subtracting 728 from 760 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 12:
91 goes into 320 3 times with a remainder of 47.
Use 3 as the next digit of our solution. 
Result so far: 9949.516483
If we take 273 away from 320, we end up with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Step 13:
470 divided by 91 is 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 9949.5164835
Subtract 455 from 470 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 14:
When dividing 150 by 91, we get 1 with a remainder of 59.
The number 1 becomes the next digit in our result. 
Result so far: 9949.51648351
If we subtract 91 from 150, we get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

After the division, we end up with 9949.51648351 and a remainder of 5.9e-08.