We look at the division of 66742 by 91 
The aim is to understand the frequency of 91 in 66742.

Moving on to step 1:
If we divide 6 by 91, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 91

Step 2:
If we divide 66 by 91, we get 0 and a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Append the next digit (7) from the dividend to 66 and continue with: 667 / 91

Step 3:
91 can be fit into 667 7 times, resulting in a remainder of 30.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we take 637 away from 667, we end up with 30.
Take the next digit (4) from the dividend and append it to 30, then repeat: 304 / 91

Step 4:
91 goes into 304 3 times with a remainder of 31.
Put 3 as the next digit of the answer. 
Result so far: 73.0
Subtracting 273 from 304 leaves us with 31.
Fetch the next digit (2) from the dividend, attach it to 31 and continue: 312 / 91

On to step 5:
312 divided by 91 is 3 with a remainder of 39.
Use 3 as the next digit of our solution. 
Result so far: 733.0
Subtracting 273 from 312 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 6:
If we divide 390 by 91, we get 4 and a remainder of 26.
The next digit of our result is 4. 
Result so far: 733.4
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.

Step 7:
91 can be fit into 260 2 times, resulting in a remainder of 78.
Use 2 as the next digit of our solution. 
Result so far: 733.42
Deduct 182 from 260 and we're left with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Let's proceed to step 8:
The number 91 fits into 780 8 times, leaving a remainder of 52.
Record the quotient 8 as the next digit in the result. 
Result so far: 733.428
If we take 728 away from 780, 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.

Moving on to step 9:
When dividing 520 by 91, we get 5 with a remainder of 65.
Write down 5 as next digit of the result. 
Result so far: 733.4285
If we subtract 455 from 520, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 10:
91 goes into 650 7 times with a remainder of 13.
The next digit of our result is 7. 
Result so far: 733.42857
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.

Step 11:
130 divided by 91 is 1 with a remainder of 39.
The number 1 becomes the next digit in our result. 
Result so far: 733.428571
Deduct 91 from 130 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 12:
When dividing 390 by 91, we get 4 with a remainder of 26.
The next digit of our result is 4. 
Result so far: 733.4285714
Subtract 364 from 390 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 13:
If we divide 260 by 91, we get 2 and a remainder of 78.
The number 2 becomes the next digit in our result. 
Result so far: 733.42857142
If we take 182 away from 260, we end up with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

The final result is 733.42857142 with a remainder of 7.8e-08.