997889 divided by 91 
The aim is to understand the frequency of 91 in 997889.

Advancing to step 1:
The number 91 fits into 9 0 times, leaving a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 91

Let's proceed to step 2:
When dividing 99 by 91, we get 1 with a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 91 from 99 to get 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 91

On to step 3:
87 divided by 91 is 0 with a remainder of 87.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 87, we get 87.
Grab the next digit (8) from the dividend, add it to 87, then carry on: 878 / 91

On to step 4:
The number 91 fits into 878 9 times, leaving a remainder of 59.
Use 9 as the next digit of our solution. 
Result so far: 109.0
The remainder is 59 after subtracting 819 from 878.
Include the next digit (8) from the dividend after 59, then repeat: 598 / 91

On to step 5:
When dividing 598 by 91, we get 6 with a remainder of 52.
Use 6 as the next digit of our solution. 
Result so far: 1096.0
Deduct 546 from 598 and we're left with 52.
Include the next digit (9) from the dividend after 52, then repeat: 529 / 91

Let's proceed to step 6:
91 can be fit into 529 5 times, resulting in a remainder of 74.
The next digit of our result is 5. 
Result so far: 10965.0
If we take 455 away from 529, we end up with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Step 7:
When dividing 740 by 91, we get 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 10965.8
Deduct 728 from 740 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 8:
91 can be fit into 120 1 times, resulting in a remainder of 29.
Use 1 as the next digit of our solution. 
Result so far: 10965.81
If we take 91 away from 120, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

On to step 9:
91 goes into 290 3 times with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 10965.813
Subtract 273 from 290 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 10:
91 goes into 170 1 times with a remainder of 79.
Use 1 as the next digit of our solution. 
Result so far: 10965.8131
If we subtract 91 from 170, we get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Moving on to step 11:
91 can be fit into 790 8 times, resulting in a remainder of 62.
Record the quotient 8 as the next digit in the result. 
Result so far: 10965.81318
Subtract 728 from 790 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Let's proceed to step 12:
91 goes into 620 6 times with a remainder of 74.
The number 6 becomes the next digit in our result. 
Result so far: 10965.813186
The remainder is 74 after subtracting 546 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Let's proceed to step 13:
740 divided by 91 is 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 10965.8131868
Subtract 728 from 740 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 14:
91 goes into 120 1 times with a remainder of 29.
Write down 1 as next digit of the result. 
Result so far: 10965.81318681
If we take 91 away from 120, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Our division results in 10965.81318681 with a remaining 2.9e-08.