91567290 ÷ 309 
The aim is to understand the frequency of 309 in 91567290.

Moving on to step 1:
309 goes into 9 0 times with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 309

Step 2:
91 divided by 309 is 0 with a remainder of 91.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 91 after subtracting 0 from 91.
Bring next digit (5) of the dividend behind the 91 and repeat the process: 915 / 309

Going ahead to step 3:
309 can be fit into 915 2 times, resulting in a remainder of 297.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 618 from 915 to get 297.
Take the next digit (6) from the dividend and append it to 297, then repeat: 2976 / 309

Let's proceed to step 4:
The number 309 fits into 2976 9 times, leaving a remainder of 195.
Use 9 as the next digit of our solution. 
Result so far: 29.0
Deduct 2781 from 2976 and we're left with 195.
Fetch the next digit (7) from the dividend, attach it to 195 and continue: 1957 / 309

On to step 5:
1957 divided by 309 is 6 with a remainder of 103.
Use 6 as the next digit of our solution. 
Result so far: 296.0
The remainder is 103 after subtracting 1854 from 1957.
Include the next digit (2) from the dividend after 103, then repeat: 1032 / 309

Step 6:
1032 divided by 309 is 3 with a remainder of 105.
Record the quotient 3 as the next digit in the result. 
Result so far: 2963.0
Deduct 927 from 1032 and we're left with 105.
Include the next digit (9) from the dividend after 105, then repeat: 1059 / 309

Going ahead to step 7:
1059 divided by 309 is 3 with a remainder of 132.
Use 3 as the next digit of our solution. 
Result so far: 29633.0
Subtract 927 from 1059 to get 132.
Include the next digit (0) from the dividend after 132, then repeat: 1320 / 309

Advancing to step 8:
When dividing 1320 by 309, we get 4 with a remainder of 84.
Record the quotient 4 as the next digit in the result. 
Result so far: 296334.0
If we take 1236 away from 1320, we end up 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.

Advancing to step 9:
The number 309 fits into 840 2 times, leaving a remainder of 222.
Write down 2 as next digit of the result. 
Result so far: 296334.2
Subtract 618 from 840 to get 222.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2220, and continue the process.

Going ahead to step 10:
2220 divided by 309 is 7 with a remainder of 57.
Write down 7 as next digit of the result. 
Result so far: 296334.27
Deduct 2163 from 2220 and we're left with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Going ahead to step 11:
If we divide 570 by 309, we get 1 and a remainder of 261.
Use 1 as the next digit of our solution. 
Result so far: 296334.271
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.

Step 12:
If we divide 2610 by 309, we get 8 and a remainder of 138.
The number 8 becomes the next digit in our result. 
Result so far: 296334.2718
Subtracting 2472 from 2610 leaves us with 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Moving on to step 13:
When dividing 1380 by 309, we get 4 with a remainder of 144.
The next digit of our result is 4. 
Result so far: 296334.27184
The remainder is 144 after subtracting 1236 from 1380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Advancing to step 14:
309 can be fit into 1440 4 times, resulting in a remainder of 204.
Put 4 as the next digit of the answer. 
Result so far: 296334.271844
If we subtract 1236 from 1440, we get 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

The final outcome is 296334.271844, with a leftover of 2.04e-05.