Let's divide 613999 by 91
The aim is to understand the frequency of 91 in 613999.

Going ahead to step 1:
If we divide 6 by 91, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Append the next digit (1) from the dividend to 6 and continue with: 61 / 91

On to step 2:
If we divide 61 by 91, we get 0 and a remainder of 61.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 61 leaves us with 61.
Fetch the next digit (3) from the dividend, attach it to 61 and continue: 613 / 91

Let's proceed to step 3:
91 goes into 613 6 times with a remainder of 67.
The next digit of our result is 6. 
Result so far: 6.0
If we take 546 away from 613, we end up with 67.
Bring next digit (9) of the dividend behind the 67 and repeat the process: 679 / 91

Advancing to step 4:
679 divided by 91 is 7 with a remainder of 42.
Use 7 as the next digit of our solution. 
Result so far: 67.0
Subtracting 637 from 679 leaves us with 42.
Fetch the next digit (9) from the dividend, attach it to 42 and continue: 429 / 91

Let's proceed to step 5:
The number 91 fits into 429 4 times, leaving a remainder of 65.
Write down 4 as next digit of the result. 
Result so far: 674.0
Subtract 364 from 429 to get 65.
Include the next digit (9) from the dividend after 65, then repeat: 659 / 91

Step 6:
659 divided by 91 is 7 with a remainder of 22.
Use 7 as the next digit of our solution. 
Result so far: 6747.0
Subtracting 637 from 659 leaves us with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 7:
The number 91 fits into 220 2 times, leaving a remainder of 38.
Put 2 as the next digit of the answer. 
Result so far: 6747.2
Subtract 182 from 220 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 8:
91 can be fit into 380 4 times, resulting in a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 6747.24
If we subtract 364 from 380, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 9:
160 divided by 91 is 1 with a remainder of 69.
The number 1 becomes the next digit in our result. 
Result so far: 6747.241
If we subtract 91 from 160, we get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 10:
If we divide 690 by 91, we get 7 and a remainder of 53.
Use 7 as the next digit of our solution. 
Result so far: 6747.2417
Subtract 637 from 690 to get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Let's proceed to step 11:
If we divide 530 by 91, we get 5 and a remainder of 75.
Write down 5 as next digit of the result. 
Result so far: 6747.24175
Deduct 455 from 530 and we're left with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Moving on to step 12:
91 can be fit into 750 8 times, resulting in a remainder of 22.
The number 8 becomes the next digit in our result. 
Result so far: 6747.241758
The remainder is 22 after subtracting 728 from 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Let's proceed to step 13:
91 goes into 220 2 times with a remainder of 38.
Record the quotient 2 as the next digit in the result. 
Result so far: 6747.2417582
If we take 182 away from 220, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 14:
91 can be fit into 380 4 times, resulting in a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 6747.24175824
The remainder is 16 after subtracting 364 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The final outcome is 6747.24175824, with a leftover of 1.6e-08.