We look at the division of 312672 by 91 
The aim is to understand the frequency of 91 in 312672.

Step 1:
3 divided by 91 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 91

Step 2:
The number 91 fits into 31 0 times, leaving a remainder of 31.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 31, we get 31.
Grab the next digit (2) from the dividend, add it to 31, then carry on: 312 / 91

Advancing to step 3:
When dividing 312 by 91, we get 3 with a remainder of 39.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we subtract 273 from 312, we get 39.
Include the next digit (6) from the dividend after 39, then repeat: 396 / 91

Moving on to step 4:
91 can be fit into 396 4 times, resulting in a remainder of 32.
Record the quotient 4 as the next digit in the result. 
Result so far: 34.0
Subtracting 364 from 396 leaves us with 32.
Include the next digit (7) from the dividend after 32, then repeat: 327 / 91

Moving on to step 5:
91 goes into 327 3 times with a remainder of 54.
Use 3 as the next digit of our solution. 
Result so far: 343.0
Subtracting 273 from 327 leaves us with 54.
Include the next digit (2) from the dividend after 54, then repeat: 542 / 91

Let's proceed to step 6:
If we divide 542 by 91, we get 5 and a remainder of 87.
Put 5 as the next digit of the answer. 
Result so far: 3435.0
Subtract 455 from 542 to get 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Advancing to step 7:
91 goes into 870 9 times with a remainder of 51.
Write down 9 as next digit of the result. 
Result so far: 3435.9
Subtract 819 from 870 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Step 8:
The number 91 fits into 510 5 times, leaving a remainder of 55.
Write down 5 as next digit of the result. 
Result so far: 3435.95
Deduct 455 from 510 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Step 9:
When dividing 550 by 91, we get 6 with a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 3435.956
Subtract 546 from 550 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 10:
The number 91 fits into 40 0 times, leaving a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 3435.956
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 11:
91 goes into 400 4 times with a remainder of 36.
The next digit of our result is 4. 
Result so far: 3435.95604
The remainder is 36 after subtracting 364 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 12:
91 can be fit into 360 3 times, resulting in a remainder of 87.
Use 3 as the next digit of our solution. 
Result so far: 3435.956043
Subtract 273 from 360 to get 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Let's proceed to step 13:
The number 91 fits into 870 9 times, leaving a remainder of 51.
Write down 9 as next digit of the result. 
Result so far: 3435.9560439
Deduct 819 from 870 and we're left with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Advancing to step 14:
91 can be fit into 510 5 times, resulting in a remainder of 55.
Record the quotient 5 as the next digit in the result. 
Result so far: 3435.95604395
Subtracting 455 from 510 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

The quotient of the division is 3435.95604395, and the remainder is 5.5e-08.