We look at the division of 15617809 by 300 
The aim is to understand the frequency of 300 in 15617809.

Step 1:
1 divided by 300 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 300

Let's proceed to step 2:
300 goes into 15 0 times with a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Include the next digit (6) from the dividend after 15, then repeat: 156 / 300

On to step 3:
The number 300 fits into 156 0 times, leaving a remainder of 156.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 156 leaves us with 156.
Include the next digit (1) from the dividend after 156, then repeat: 1561 / 300

Advancing to step 4:
When dividing 1561 by 300, we get 5 with a remainder of 61.
The next digit of our result is 5. 
Result so far: 5.0
Deduct 1500 from 1561 and we're left with 61.
Bring next digit (7) of the dividend behind the 61 and repeat the process: 617 / 300

Moving on to step 5:
300 goes into 617 2 times with a remainder of 17.
Write down 2 as next digit of the result. 
Result so far: 52.0
Subtracting 600 from 617 leaves us with 17.
Take the next digit (8) from the dividend and append it to 17, then repeat: 178 / 300

Advancing to step 6:
300 can be fit into 178 0 times, resulting in a remainder of 178.
Write down 0 as next digit of the result. 
Result so far: 520.0
Subtracting 0 from 178 leaves us with 178.
Fetch the next digit (0) from the dividend, attach it to 178 and continue: 1780 / 300

Moving on to step 7:
1780 divided by 300 is 5 with a remainder of 280.
The number 5 becomes the next digit in our result. 
Result so far: 5205.0
If we subtract 1500 from 1780, we get 280.
Include the next digit (9) from the dividend after 280, then repeat: 2809 / 300

Moving on to step 8:
300 can be fit into 2809 9 times, resulting in a remainder of 109.
Write down 9 as next digit of the result. 
Result so far: 52059.0
Subtract 2700 from 2809 to get 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

Advancing to step 9:
300 can be fit into 1090 3 times, resulting in a remainder of 190.
Write down 3 as next digit of the result. 
Result so far: 52059.3
If we take 900 away from 1090, we end up with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Moving on to step 10:
1900 divided by 300 is 6 with a remainder of 100.
Use 6 as the next digit of our solution. 
Result so far: 52059.36
Subtracting 1800 from 1900 leaves us with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

On to step 11:
300 can be fit into 1000 3 times, resulting in a remainder of 100.
Put 3 as the next digit of the answer. 
Result so far: 52059.363
Deduct 900 from 1000 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

On to step 12:
1000 divided by 300 is 3 with a remainder of 100.
The number 3 becomes the next digit in our result. 
Result so far: 52059.3633
If we subtract 900 from 1000, we get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

The final outcome is 52059.3633, with a leftover of 0.001.