126251 ÷ 91 
The aim is to understand the frequency of 91 in 126251.

Let's proceed to step 1:
91 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 91

Let's proceed to step 2:
The number 91 fits into 12 0 times, leaving a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Fetch the next digit (6) from the dividend, attach it to 12 and continue: 126 / 91

Moving on to step 3:
126 divided by 91 is 1 with a remainder of 35.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 91 from 126, we get 35.
Take the next digit (2) from the dividend and append it to 35, then repeat: 352 / 91

Advancing to step 4:
If we divide 352 by 91, we get 3 and a remainder of 79.
Put 3 as the next digit of the answer. 
Result so far: 13.0
If we subtract 273 from 352, we get 79.
Bring next digit (5) of the dividend behind the 79 and repeat the process: 795 / 91

Advancing to step 5:
795 divided by 91 is 8 with a remainder of 67.
Write down 8 as next digit of the result. 
Result so far: 138.0
Subtracting 728 from 795 leaves us with 67.
Include the next digit (1) from the dividend after 67, then repeat: 671 / 91

Advancing to step 6:
671 divided by 91 is 7 with a remainder of 34.
The number 7 becomes the next digit in our result. 
Result so far: 1387.0
Subtracting 637 from 671 leaves us with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 7:
The number 91 fits into 340 3 times, leaving a remainder of 67.
Write down 3 as next digit of the result. 
Result so far: 1387.3
Subtracting 273 from 340 leaves us with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Let's proceed to step 8:
If we divide 670 by 91, we get 7 and a remainder of 33.
Use 7 as the next digit of our solution. 
Result so far: 1387.37
The remainder is 33 after subtracting 637 from 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

On to step 9:
If we divide 330 by 91, we get 3 and a remainder of 57.
Record the quotient 3 as the next digit in the result. 
Result so far: 1387.373
If we take 273 away from 330, we end up with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Moving on to step 10:
91 can be fit into 570 6 times, resulting in a remainder of 24.
The next digit of our result is 6. 
Result so far: 1387.3736
The remainder is 24 after subtracting 546 from 570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 11:
The number 91 fits into 240 2 times, leaving a remainder of 58.
Put 2 as the next digit of the answer. 
Result so far: 1387.37362
Deduct 182 from 240 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Step 12:
If we divide 580 by 91, we get 6 and a remainder of 34.
The number 6 becomes the next digit in our result. 
Result so far: 1387.373626
Subtracting 546 from 580 leaves us with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 13:
91 can be fit into 340 3 times, resulting in a remainder of 67.
Put 3 as the next digit of the answer. 
Result so far: 1387.3736263
The remainder is 67 after subtracting 273 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Let's proceed to step 14:
When dividing 670 by 91, we get 7 with a remainder of 33.
The number 7 becomes the next digit in our result. 
Result so far: 1387.37362637
If we subtract 637 from 670, we get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Our division results in 1387.37362637 with a remaining 3.3e-08.