Let's divide 42066357 by 91
The aim is to understand the frequency of 91 in 42066357.

Step 1:
The number 91 fits into 4 0 times, leaving a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Take the next digit (2) from the dividend and append it to 4, then repeat: 42 / 91

Advancing to step 2:
91 goes into 42 0 times with a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 42 after subtracting 0 from 42.
Take the next digit (0) from the dividend and append it to 42, then repeat: 420 / 91

Advancing to step 3:
If we divide 420 by 91, we get 4 and a remainder of 56.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we subtract 364 from 420, we get 56.
Append the next digit (6) from the dividend to 56 and continue with: 566 / 91

Advancing to step 4:
566 divided by 91 is 6 with a remainder of 20.
Record the quotient 6 as the next digit in the result. 
Result so far: 46.0
Deduct 546 from 566 and we're left with 20.
Include the next digit (6) from the dividend after 20, then repeat: 206 / 91

Moving on to step 5:
91 can be fit into 206 2 times, resulting in a remainder of 24.
The next digit of our result is 2. 
Result so far: 462.0
If we subtract 182 from 206, we get 24.
Fetch the next digit (3) from the dividend, attach it to 24 and continue: 243 / 91

Step 6:
The number 91 fits into 243 2 times, leaving a remainder of 61.
Put 2 as the next digit of the answer. 
Result so far: 4622.0
If we take 182 away from 243, we end up with 61.
Fetch the next digit (5) from the dividend, attach it to 61 and continue: 615 / 91

Going ahead to step 7:
When dividing 615 by 91, we get 6 with a remainder of 69.
The number 6 becomes the next digit in our result. 
Result so far: 46226.0
Subtract 546 from 615 to get 69.
Bring next digit (7) of the dividend behind the 69 and repeat the process: 697 / 91

Step 8:
When dividing 697 by 91, we get 7 with a remainder of 60.
Write down 7 as next digit of the result. 
Result so far: 462267.0
If we take 637 away from 697, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 9:
The number 91 fits into 600 6 times, leaving a remainder of 54.
Put 6 as the next digit of the answer. 
Result so far: 462267.6
Subtract 546 from 600 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 10:
91 goes into 540 5 times with a remainder of 85.
Record the quotient 5 as the next digit in the result. 
Result so far: 462267.65
The remainder is 85 after subtracting 455 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Going ahead to step 11:
The number 91 fits into 850 9 times, leaving a remainder of 31.
The number 9 becomes the next digit in our result. 
Result so far: 462267.659
Subtracting 819 from 850 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Let's proceed to step 12:
91 goes into 310 3 times with a remainder of 37.
The next digit of our result is 3. 
Result so far: 462267.6593
Deduct 273 from 310 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

On to step 13:
If we divide 370 by 91, we get 4 and a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 462267.65934
Subtracting 364 from 370 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 14:
91 can be fit into 60 0 times, resulting in a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 462267.65934
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 15:
The number 91 fits into 600 6 times, leaving a remainder of 54.
Use 6 as the next digit of our solution. 
Result so far: 462267.6593406
If we take 546 away from 600, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 16:
If we divide 540 by 91, we get 5 and a remainder of 85.
The next digit of our result is 5. 
Result so far: 462267.65934065
The remainder is 85 after subtracting 455 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

After the division, we end up with 462267.65934065 and a remainder of 8.5e-08.