We're dividing 91915710 by 309 
The aim is to understand the frequency of 309 in 91915710.

Going ahead to step 1:
The number 309 fits into 9 0 times, leaving a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 309

Going ahead to step 2:
When dividing 91 by 309, we get 0 with a remainder of 91.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 91 to get 91.
Include the next digit (9) from the dividend after 91, then repeat: 919 / 309

Let's proceed to step 3:
919 divided by 309 is 2 with a remainder of 301.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 618 from 919 and we're left with 301.
Fetch the next digit (1) from the dividend, attach it to 301 and continue: 3011 / 309

On to step 4:
309 can be fit into 3011 9 times, resulting in a remainder of 230.
Write down 9 as next digit of the result. 
Result so far: 29.0
Subtract 2781 from 3011 to get 230.
Fetch the next digit (5) from the dividend, attach it to 230 and continue: 2305 / 309

Going ahead to step 5:
2305 divided by 309 is 7 with a remainder of 142.
Use 7 as the next digit of our solution. 
Result so far: 297.0
Deduct 2163 from 2305 and we're left with 142.
Take the next digit (7) from the dividend and append it to 142, then repeat: 1427 / 309

Going ahead to step 6:
If we divide 1427 by 309, we get 4 and a remainder of 191.
The number 4 becomes the next digit in our result. 
Result so far: 2974.0
Subtracting 1236 from 1427 leaves us with 191.
Include the next digit (1) from the dividend after 191, then repeat: 1911 / 309

Let's proceed to step 7:
309 can be fit into 1911 6 times, resulting in a remainder of 57.
Record the quotient 6 as the next digit in the result. 
Result so far: 29746.0
If we subtract 1854 from 1911, we get 57.
Bring next digit (0) of the dividend behind the 57 and repeat the process: 570 / 309

Step 8:
309 can be fit into 570 1 times, resulting in a remainder of 261.
Write down 1 as next digit of the result. 
Result so far: 297461.0
Subtract 309 from 570 to get 261.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2610, and continue the process.

Going ahead to step 9:
If we divide 2610 by 309, we get 8 and a remainder of 138.
The next digit of our result is 8. 
Result so far: 297461.8
Subtract 2472 from 2610 to get 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

On to step 10:
The number 309 fits into 1380 4 times, leaving a remainder of 144.
Put 4 as the next digit of the answer. 
Result so far: 297461.84
Subtracting 1236 from 1380 leaves us with 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

On to step 11:
309 can be fit into 1440 4 times, resulting in a remainder of 204.
Write down 4 as next digit of the result. 
Result so far: 297461.844
Deduct 1236 from 1440 and we're left with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Our division results in 297461.844 with a remaining 0.0204.