We look at the division of 377673 by 91 
The aim is to understand the frequency of 91 in 377673.

Step 1:
The number 91 fits into 3 0 times, leaving a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (7) from the dividend after 3, then repeat: 37 / 91

Step 2:
If we divide 37 by 91, we get 0 and a remainder of 37.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 37 after subtracting 0 from 37.
Append the next digit (7) from the dividend to 37 and continue with: 377 / 91

Going ahead to step 3:
91 can be fit into 377 4 times, resulting in a remainder of 13.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 364 from 377 to get 13.
Take the next digit (6) from the dividend and append it to 13, then repeat: 136 / 91

Let's proceed to step 4:
When dividing 136 by 91, we get 1 with a remainder of 45.
The next digit of our result is 1. 
Result so far: 41.0
If we take 91 away from 136, we end up with 45.
Bring next digit (7) of the dividend behind the 45 and repeat the process: 457 / 91

Advancing to step 5:
91 goes into 457 5 times with a remainder of 2.
Record the quotient 5 as the next digit in the result. 
Result so far: 415.0
Subtract 455 from 457 to get 2.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 91

On to step 6:
23 divided by 91 is 0 with a remainder of 23.
Use 0 as the next digit of our solution. 
Result so far: 4150.0
Deduct 0 from 23 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Moving on to step 7:
If we divide 230 by 91, we get 2 and a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 4150.2
Subtracting 182 from 230 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 8:
When dividing 480 by 91, we get 5 with a remainder of 25.
The next digit of our result is 5. 
Result so far: 4150.25
If we take 455 away from 480, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 9:
250 divided by 91 is 2 with a remainder of 68.
Put 2 as the next digit of the answer. 
Result so far: 4150.252
Deduct 182 from 250 and we're left with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Advancing to step 10:
91 goes into 680 7 times with a remainder of 43.
The number 7 becomes the next digit in our result. 
Result so far: 4150.2527
The remainder is 43 after subtracting 637 from 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

On to step 11:
91 goes into 430 4 times with a remainder of 66.
Use 4 as the next digit of our solution. 
Result so far: 4150.25274
If we take 364 away from 430, we end up with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Moving on to step 12:
If we divide 660 by 91, we get 7 and a remainder of 23.
Write down 7 as next digit of the result. 
Result so far: 4150.252747
Deduct 637 from 660 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

On to step 13:
230 divided by 91 is 2 with a remainder of 48.
The next digit of our result is 2. 
Result so far: 4150.2527472
Deduct 182 from 230 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 14:
91 can be fit into 480 5 times, resulting in a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 4150.25274725
Subtracting 455 from 480 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

In conclusion, the division gives 4150.25274725 with a balance of 2.5e-08.