251517 ÷ 91 
The aim is to understand the frequency of 91 in 251517.

Moving on to step 1:
91 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 91

Let's proceed to step 2:
The number 91 fits into 25 0 times, leaving a remainder of 25.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 25 leaves us with 25.
Fetch the next digit (1) from the dividend, attach it to 25 and continue: 251 / 91

Step 3:
251 divided by 91 is 2 with a remainder of 69.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 182 from 251, we get 69.
Include the next digit (5) from the dividend after 69, then repeat: 695 / 91

Advancing to step 4:
91 goes into 695 7 times with a remainder of 58.
Write down 7 as next digit of the result. 
Result so far: 27.0
If we take 637 away from 695, we end up with 58.
Include the next digit (1) from the dividend after 58, then repeat: 581 / 91

On to step 5:
The number 91 fits into 581 6 times, leaving a remainder of 35.
The next digit of our result is 6. 
Result so far: 276.0
Subtracting 546 from 581 leaves us with 35.
Bring next digit (7) of the dividend behind the 35 and repeat the process: 357 / 91

Moving on to step 6:
91 can be fit into 357 3 times, resulting in a remainder of 84.
Write down 3 as next digit of the result. 
Result so far: 2763.0
Subtracting 273 from 357 leaves us with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Step 7:
840 divided by 91 is 9 with a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 2763.9
If we subtract 819 from 840, we get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 8:
When dividing 210 by 91, we get 2 with a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 2763.92
If we take 182 away from 210, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 9:
When dividing 280 by 91, we get 3 with a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 2763.923
If we take 273 away from 280, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 10:
When dividing 70 by 91, we get 0 with a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 2763.923
Subtracting 0 from 70 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 11:
The number 91 fits into 700 7 times, leaving a remainder of 63.
Put 7 as the next digit of the answer. 
Result so far: 2763.92307
The remainder is 63 after subtracting 637 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Moving on to step 12:
If we divide 630 by 91, we get 6 and a remainder of 84.
Use 6 as the next digit of our solution. 
Result so far: 2763.923076
The remainder is 84 after subtracting 546 from 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Advancing to step 13:
If we divide 840 by 91, we get 9 and a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 2763.9230769
If we take 819 away from 840, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 14:
210 divided by 91 is 2 with a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 2763.92307692
If we subtract 182 from 210, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Our division results in 2763.92307692 with a remaining 2.8e-08.