Let's divide 668902 by 91
The aim is to understand the frequency of 91 in 668902.

Step 1:
When dividing 6 by 91, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 91

On to step 2:
When dividing 66 by 91, we get 0 with a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 66, we get 66.
Grab the next digit (8) from the dividend, add it to 66, then carry on: 668 / 91

Going ahead to step 3:
The number 91 fits into 668 7 times, leaving a remainder of 31.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtracting 637 from 668 leaves us with 31.
Grab the next digit (9) from the dividend, add it to 31, then carry on: 319 / 91

Moving on to step 4:
If we divide 319 by 91, we get 3 and a remainder of 46.
The next digit of our result is 3. 
Result so far: 73.0
Deduct 273 from 319 and we're left with 46.
Include the next digit (0) from the dividend after 46, then repeat: 460 / 91

Step 5:
460 divided by 91 is 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 735.0
If we subtract 455 from 460, we get 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 91

Let's proceed to step 6:
52 divided by 91 is 0 with a remainder of 52.
The number 0 becomes the next digit in our result. 
Result so far: 7350.0
If we take 0 away from 52, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 7:
91 goes into 520 5 times with a remainder of 65.
The number 5 becomes the next digit in our result. 
Result so far: 7350.5
The remainder is 65 after subtracting 455 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Let's proceed to step 8:
If we divide 650 by 91, we get 7 and a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 7350.57
Subtracting 637 from 650 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 9:
130 divided by 91 is 1 with a remainder of 39.
Write down 1 as next digit of the result. 
Result so far: 7350.571
If we subtract 91 from 130, we get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 10:
91 goes into 390 4 times with a remainder of 26.
The next digit of our result is 4. 
Result so far: 7350.5714
If we take 364 away from 390, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 11:
If we divide 260 by 91, we get 2 and a remainder of 78.
Write down 2 as next digit of the result. 
Result so far: 7350.57142
The remainder is 78 after subtracting 182 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Moving on to step 12:
91 can be fit into 780 8 times, resulting in a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 7350.571428
Deduct 728 from 780 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 13:
520 divided by 91 is 5 with a remainder of 65.
Record the quotient 5 as the next digit in the result. 
Result so far: 7350.5714285
Deduct 455 from 520 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 14:
When dividing 650 by 91, we get 7 with a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 7350.57142857
If we take 637 away from 650, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The final result is 7350.57142857 with a remainder of 1.3e-08.