698140 ÷ 91 
The aim is to understand the frequency of 91 in 698140.

Step 1:
91 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Take the next digit (9) from the dividend and append it to 6, then repeat: 69 / 91

Moving on to step 2:
91 goes into 69 0 times with a remainder of 69.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 69, we get 69.
Take the next digit (8) from the dividend and append it to 69, then repeat: 698 / 91

Advancing to step 3:
91 can be fit into 698 7 times, resulting in a remainder of 61.
Write down 7 as next digit of the result. 
Result so far: 7.0
Subtracting 637 from 698 leaves us with 61.
Bring next digit (1) of the dividend behind the 61 and repeat the process: 611 / 91

Let's proceed to step 4:
If we divide 611 by 91, we get 6 and a remainder of 65.
Use 6 as the next digit of our solution. 
Result so far: 76.0
Subtracting 546 from 611 leaves us with 65.
Include the next digit (4) from the dividend after 65, then repeat: 654 / 91

Step 5:
The number 91 fits into 654 7 times, leaving a remainder of 17.
Use 7 as the next digit of our solution. 
Result so far: 767.0
If we take 637 away from 654, we end up with 17.
Bring next digit (0) of the dividend behind the 17 and repeat the process: 170 / 91

Step 6:
When dividing 170 by 91, we get 1 with a remainder of 79.
Use 1 as the next digit of our solution. 
Result so far: 7671.0
Subtract 91 from 170 to 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.

Step 7:
91 goes into 790 8 times with a remainder of 62.
Write down 8 as next digit of the result. 
Result so far: 7671.8
Subtracting 728 from 790 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

On to step 8:
91 can be fit into 620 6 times, resulting in a remainder of 74.
The next digit of our result is 6. 
Result so far: 7671.86
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.

On to step 9:
When dividing 740 by 91, we get 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 7671.868
Subtracting 728 from 740 leaves us 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.

Advancing to step 10:
If we divide 120 by 91, we get 1 and a remainder of 29.
Record the quotient 1 as the next digit in the result. 
Result so far: 7671.8681
Subtracting 91 from 120 leaves us 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.

Moving on to step 11:
91 goes into 290 3 times with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 7671.86813
If we take 273 away from 290, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 12:
91 goes into 170 1 times with a remainder of 79.
The next digit of our result is 1. 
Result so far: 7671.868131
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.

Advancing to step 13:
790 divided by 91 is 8 with a remainder of 62.
Record the quotient 8 as the next digit in the result. 
Result so far: 7671.8681318
The remainder is 62 after subtracting 728 from 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 14:
If we divide 620 by 91, we get 6 and a remainder of 74.
The number 6 becomes the next digit in our result. 
Result so far: 7671.86813186
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.

The final outcome is 7671.86813186, with a leftover of 7.4e-08.