We divide 726406 by 91
The aim is to understand the frequency of 91 in 726406.

Step 1:
When dividing 7 by 91, we get 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Fetch the next digit (2) from the dividend, attach it to 7 and continue: 72 / 91

On to step 2:
91 can be fit into 72 0 times, resulting in a remainder of 72.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 72, we end up with 72.
Take the next digit (6) from the dividend and append it to 72, then repeat: 726 / 91

On to step 3:
726 divided by 91 is 7 with a remainder of 89.
Write down 7 as next digit of the result. 
Result so far: 7.0
Deduct 637 from 726 and we're left with 89.
Take the next digit (4) from the dividend and append it to 89, then repeat: 894 / 91

Step 4:
The number 91 fits into 894 9 times, leaving a remainder of 75.
Record the quotient 9 as the next digit in the result. 
Result so far: 79.0
If we take 819 away from 894, we end up with 75.
Append the next digit (0) from the dividend to 75 and continue with: 750 / 91

Moving on to step 5:
When dividing 750 by 91, we get 8 with a remainder of 22.
The next digit of our result is 8. 
Result so far: 798.0
Deduct 728 from 750 and we're left with 22.
Fetch the next digit (6) from the dividend, attach it to 22 and continue: 226 / 91

Moving on to step 6:
When dividing 226 by 91, we get 2 with a remainder of 44.
The number 2 becomes the next digit in our result. 
Result so far: 7982.0
Deduct 182 from 226 and we're left 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.

Moving on to step 7:
91 can be fit into 440 4 times, resulting in a remainder of 76.
Write down 4 as next digit of the result. 
Result so far: 7982.4
Subtracting 364 from 440 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Going ahead to step 8:
760 divided by 91 is 8 with a remainder of 32.
Record the quotient 8 as the next digit in the result. 
Result so far: 7982.48
Subtract 728 from 760 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 9:
The number 91 fits into 320 3 times, leaving a remainder of 47.
Record the quotient 3 as the next digit in the result. 
Result so far: 7982.483
The remainder is 47 after subtracting 273 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Let's proceed to step 10:
91 can be fit into 470 5 times, resulting in a remainder of 15.
The next digit of our result is 5. 
Result so far: 7982.4835
If we subtract 455 from 470, we 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.

Step 11:
The number 91 fits into 150 1 times, leaving a remainder of 59.
The next digit of our result is 1. 
Result so far: 7982.48351
Deduct 91 from 150 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Step 12:
If we divide 590 by 91, we get 6 and a remainder of 44.
The number 6 becomes the next digit in our result. 
Result so far: 7982.483516
If we take 546 away from 590, we end up 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.

On to step 13:
91 can be fit into 440 4 times, resulting in a remainder of 76.
Put 4 as the next digit of the answer. 
Result so far: 7982.4835164
If we take 364 away from 440, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Advancing to step 14:
91 can be fit into 760 8 times, resulting in a remainder of 32.
The next digit of our result is 8. 
Result so far: 7982.48351648
If we take 728 away from 760, we end up 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.

The final result is 7982.48351648 with a remainder of 3.2e-08.