11506599 ÷ 309 
The aim is to understand the frequency of 309 in 11506599.

Let's proceed to step 1:
If we divide 1 by 309, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (1) from the dividend, add it to 1, then carry on: 11 / 309

Step 2:
11 divided by 309 is 0 with a remainder of 11.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 11 and we're left with 11.
Grab the next digit (5) from the dividend, add it to 11, then carry on: 115 / 309

On to step 3:
309 can be fit into 115 0 times, resulting in a remainder of 115.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 115 and we're left with 115.
Grab the next digit (0) from the dividend, add it to 115, then carry on: 1150 / 309

Moving on to step 4:
When dividing 1150 by 309, we get 3 with a remainder of 223.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtracting 927 from 1150 leaves us with 223.
Fetch the next digit (6) from the dividend, attach it to 223 and continue: 2236 / 309

Moving on to step 5:
309 goes into 2236 7 times with a remainder of 73.
Write down 7 as next digit of the result. 
Result so far: 37.0
Deduct 2163 from 2236 and we're left with 73.
Take the next digit (5) from the dividend and append it to 73, then repeat: 735 / 309

Advancing to step 6:
The number 309 fits into 735 2 times, leaving a remainder of 117.
The number 2 becomes the next digit in our result. 
Result so far: 372.0
Subtracting 618 from 735 leaves us with 117.
Take the next digit (9) from the dividend and append it to 117, then repeat: 1179 / 309

Moving on to step 7:
When dividing 1179 by 309, we get 3 with a remainder of 252.
Put 3 as the next digit of the answer. 
Result so far: 3723.0
Subtracting 927 from 1179 leaves us with 252.
Bring next digit (9) of the dividend behind the 252 and repeat the process: 2529 / 309

Step 8:
If we divide 2529 by 309, we get 8 and a remainder of 57.
Record the quotient 8 as the next digit in the result. 
Result so far: 37238.0
If we subtract 2472 from 2529, we get 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 9:
570 divided by 309 is 1 with a remainder of 261.
The number 1 becomes the next digit in our result. 
Result so far: 37238.1
If we take 309 away from 570, we end up with 261.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2610, and continue the process.

Advancing to step 10:
The number 309 fits into 2610 8 times, leaving a remainder of 138.
The number 8 becomes the next digit in our result. 
Result so far: 37238.18
The remainder is 138 after subtracting 2472 from 2610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Advancing to step 11:
If we divide 1380 by 309, we get 4 and a remainder of 144.
The next digit of our result is 4. 
Result so far: 37238.184
Deduct 1236 from 1380 and we're left 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.

Let's proceed to step 12:
309 can be fit into 1440 4 times, resulting in a remainder of 204.
Record the quotient 4 as the next digit in the result. 
Result so far: 37238.1844
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 result is 37238.1844 with a remainder of 0.00204.