875388 divided by 91 
The aim is to understand the frequency of 91 in 875388.

On to step 1:
If we divide 8 by 91, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 91

Going ahead to step 2:
The number 91 fits into 87 0 times, leaving a remainder of 87.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 87 to get 87.
Bring next digit (5) of the dividend behind the 87 and repeat the process: 875 / 91

Step 3:
If we divide 875 by 91, we get 9 and a remainder of 56.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
If we subtract 819 from 875, we get 56.
Bring next digit (3) of the dividend behind the 56 and repeat the process: 563 / 91

Let's proceed to step 4:
The number 91 fits into 563 6 times, leaving a remainder of 17.
The next digit of our result is 6. 
Result so far: 96.0
Subtracting 546 from 563 leaves us with 17.
Fetch the next digit (8) from the dividend, attach it to 17 and continue: 178 / 91

Step 5:
If we divide 178 by 91, we get 1 and a remainder of 87.
Use 1 as the next digit of our solution. 
Result so far: 961.0
If we subtract 91 from 178, we get 87.
Append the next digit (8) from the dividend to 87 and continue with: 878 / 91

Advancing to step 6:
The number 91 fits into 878 9 times, leaving a remainder of 59.
Put 9 as the next digit of the answer. 
Result so far: 9619.0
If we subtract 819 from 878, we get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Let's proceed to step 7:
91 can be fit into 590 6 times, resulting in a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 9619.6
If we subtract 546 from 590, we get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 8:
If we divide 440 by 91, we get 4 and a remainder of 76.
Write down 4 as next digit of the result. 
Result so far: 9619.64
Subtracting 364 from 440 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 9:
When dividing 760 by 91, we get 8 with a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 9619.648
Subtracting 728 from 760 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 10:
320 divided by 91 is 3 with a remainder of 47.
Write down 3 as next digit of the result. 
Result so far: 9619.6483
If we take 273 away from 320, we end up with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Going ahead to step 11:
91 can be fit into 470 5 times, resulting in a remainder of 15.
The next digit of our result is 5. 
Result so far: 9619.64835
If we take 455 away from 470, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 12:
150 divided by 91 is 1 with a remainder of 59.
Put 1 as the next digit of the answer. 
Result so far: 9619.648351
If we take 91 away from 150, we end up with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Advancing to step 13:
If we divide 590 by 91, we get 6 and a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 9619.6483516
If we take 546 away from 590, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 14:
The number 91 fits into 440 4 times, leaving a remainder of 76.
Write down 4 as next digit of the result. 
Result so far: 9619.64835164
If we take 364 away from 440, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

In conclusion, the division gives 9619.64835164 with a balance of 7.6e-08.