Let's divide 85401 by 91
The aim is to understand the frequency of 91 in 85401.

Going ahead to step 1:
8 divided by 91 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 91

Let's proceed to step 2:
85 divided by 91 is 0 with a remainder of 85.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 85 after subtracting 0 from 85.
Append the next digit (4) from the dividend to 85 and continue with: 854 / 91

Going ahead to step 3:
When dividing 854 by 91, we get 9 with a remainder of 35.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtracting 819 from 854 leaves us with 35.
Include the next digit (0) from the dividend after 35, then repeat: 350 / 91

Step 4:
350 divided by 91 is 3 with a remainder of 77.
Record the quotient 3 as the next digit in the result. 
Result so far: 93.0
The remainder is 77 after subtracting 273 from 350.
Include the next digit (1) from the dividend after 77, then repeat: 771 / 91

Going ahead to step 5:
771 divided by 91 is 8 with a remainder of 43.
Write down 8 as next digit of the result. 
Result so far: 938.0
If we subtract 728 from 771, we get 43.
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 6:
If we divide 430 by 91, we get 4 and a remainder of 66.
Use 4 as the next digit of our solution. 
Result so far: 938.4
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 7:
660 divided by 91 is 7 with a remainder of 23.
Record the quotient 7 as the next digit in the result. 
Result so far: 938.47
Subtracting 637 from 660 leaves us 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.

Step 8:
91 can be fit into 230 2 times, resulting in a remainder of 48.
The number 2 becomes the next digit in our result. 
Result so far: 938.472
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 9:
480 divided by 91 is 5 with a remainder of 25.
The next digit of our result is 5. 
Result so far: 938.4725
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.

On to step 10:
The number 91 fits into 250 2 times, leaving a remainder of 68.
Record the quotient 2 as the next digit in the result. 
Result so far: 938.47252
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 11:
91 can be fit into 680 7 times, resulting in a remainder of 43.
Use 7 as the next digit of our solution. 
Result so far: 938.472527
If we take 637 away from 680, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Moving on to step 12:
430 divided by 91 is 4 with a remainder of 66.
Use 4 as the next digit of our solution. 
Result so far: 938.4725274
The remainder is 66 after subtracting 364 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 13:
The number 91 fits into 660 7 times, leaving a remainder of 23.
The next digit of our result is 7. 
Result so far: 938.47252747
If we take 637 away from 660, we end up 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.

The quotient of the division is 938.47252747, and the remainder is 2.3e-08.