We look at the division of 612902 by 91 
The aim is to understand the frequency of 91 in 612902.

Advancing to step 1:
The number 91 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 91

Let's proceed to step 2:
91 goes into 61 0 times with a remainder of 61.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 61, we end up with 61.
Take the next digit (2) from the dividend and append it to 61, then repeat: 612 / 91

Step 3:
91 goes into 612 6 times with a remainder of 66.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Deduct 546 from 612 and we're left with 66.
Grab the next digit (9) from the dividend, add it to 66, then carry on: 669 / 91

On to step 4:
If we divide 669 by 91, we get 7 and a remainder of 32.
The next digit of our result is 7. 
Result so far: 67.0
The remainder is 32 after subtracting 637 from 669.
Grab the next digit (0) from the dividend, add it to 32, then carry on: 320 / 91

Advancing to step 5:
91 goes into 320 3 times with a remainder of 47.
Record the quotient 3 as the next digit in the result. 
Result so far: 673.0
Subtract 273 from 320 to get 47.
Bring next digit (2) of the dividend behind the 47 and repeat the process: 472 / 91

Advancing to step 6:
When dividing 472 by 91, we get 5 with a remainder of 17.
Record the quotient 5 as the next digit in the result. 
Result so far: 6735.0
If we take 455 away from 472, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 7:
91 goes into 170 1 times with a remainder of 79.
The next digit of our result is 1. 
Result so far: 6735.1
If we take 91 away from 170, we end up with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Advancing to step 8:
The number 91 fits into 790 8 times, leaving a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 6735.18
Deduct 728 from 790 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

On to step 9:
The number 91 fits into 620 6 times, leaving a remainder of 74.
Put 6 as the next digit of the answer. 
Result so far: 6735.186
Deduct 546 from 620 and we're left with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Advancing to step 10:
91 can be fit into 740 8 times, resulting in a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 6735.1868
The remainder is 12 after subtracting 728 from 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 11:
The number 91 fits into 120 1 times, leaving a remainder of 29.
Record the quotient 1 as the next digit in the result. 
Result so far: 6735.18681
Subtract 91 from 120 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Step 12:
290 divided by 91 is 3 with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 6735.186813
If we take 273 away from 290, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 13:
When dividing 170 by 91, we get 1 with a remainder of 79.
Put 1 as the next digit of the answer. 
Result so far: 6735.1868131
Subtracting 91 from 170 leaves us with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Moving on to step 14:
If we divide 790 by 91, we get 8 and a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 6735.18681318
The remainder is 62 after subtracting 728 from 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

In conclusion, the division gives 6735.18681318 with a balance of 6.2e-08.