We look at the division of 699710 by 91 
The aim is to understand the frequency of 91 in 699710.

Advancing to step 1:
The number 91 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (9) from the dividend and append it to 6, then repeat: 69 / 91

Advancing to step 2:
69 divided by 91 is 0 with a remainder of 69.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 69, we end up with 69.
Take the next digit (9) from the dividend and append it to 69, then repeat: 699 / 91

On to step 3:
If we divide 699 by 91, we get 7 and a remainder of 62.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we subtract 637 from 699, we get 62.
Fetch the next digit (7) from the dividend, attach it to 62 and continue: 627 / 91

Moving on to step 4:
If we divide 627 by 91, we get 6 and a remainder of 81.
Use 6 as the next digit of our solution. 
Result so far: 76.0
If we subtract 546 from 627, we get 81.
Include the next digit (1) from the dividend after 81, then repeat: 811 / 91

On to step 5:
91 can be fit into 811 8 times, resulting in a remainder of 83.
Use 8 as the next digit of our solution. 
Result so far: 768.0
If we subtract 728 from 811, we get 83.
Take the next digit (0) from the dividend and append it to 83, then repeat: 830 / 91

On to step 6:
91 goes into 830 9 times with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 7689.0
If we take 819 away from 830, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 7:
91 goes into 110 1 times with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 7689.1
Subtracting 91 from 110 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 8:
When dividing 190 by 91, we get 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 7689.12
Subtract 182 from 190 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 9:
If we divide 80 by 91, we get 0 and a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 7689.12
If we take 0 away from 80, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 10:
91 can be fit into 800 8 times, resulting in a remainder of 72.
Record the quotient 8 as the next digit in the result. 
Result so far: 7689.1208
If we take 728 away from 800, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Going ahead to step 11:
91 goes into 720 7 times with a remainder of 83.
The next digit of our result is 7. 
Result so far: 7689.12087
If we take 637 away from 720, we end up with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Going ahead to step 12:
91 can be fit into 830 9 times, resulting in a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 7689.120879
Deduct 819 from 830 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 13:
When dividing 110 by 91, we get 1 with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 7689.1208791
Subtract 91 from 110 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 14:
When dividing 190 by 91, we get 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 7689.12087912
If we subtract 182 from 190, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

After the division, we end up with 7689.12087912 and a remainder of 8e-09.