Let's divide 2909389 by 509
The aim is to understand the frequency of 509 in 2909389.

Advancing to step 1:
509 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (9) from the dividend to 2 and continue with: 29 / 509

Advancing to step 2:
The number 509 fits into 29 0 times, leaving a remainder of 29.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 29 to get 29.
Bring next digit (0) of the dividend behind the 29 and repeat the process: 290 / 509

On to step 3:
When dividing 290 by 509, we get 0 with a remainder of 290.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 290 leaves us with 290.
Append the next digit (9) from the dividend to 290 and continue with: 2909 / 509

On to step 4:
When dividing 2909 by 509, we get 5 with a remainder of 364.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we take 2545 away from 2909, we end up with 364.
Include the next digit (3) from the dividend after 364, then repeat: 3643 / 509

Let's proceed to step 5:
3643 divided by 509 is 7 with a remainder of 80.
The number 7 becomes the next digit in our result. 
Result so far: 57.0
If we take 3563 away from 3643, we end up with 80.
Grab the next digit (8) from the dividend, add it to 80, then carry on: 808 / 509

Going ahead to step 6:
When dividing 808 by 509, we get 1 with a remainder of 299.
Use 1 as the next digit of our solution. 
Result so far: 571.0
If we take 509 away from 808, we end up with 299.
Take the next digit (9) from the dividend and append it to 299, then repeat: 2999 / 509

Moving on to step 7:
509 goes into 2999 5 times with a remainder of 454.
Write down 5 as next digit of the result. 
Result so far: 5715.0
Deduct 2545 from 2999 and we're left with 454.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4540, and continue the process.

Let's proceed to step 8:
When dividing 4540 by 509, we get 8 with a remainder of 468.
The next digit of our result is 8. 
Result so far: 5715.8
The remainder is 468 after subtracting 4072 from 4540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4680, and continue the process.

Moving on to step 9:
4680 divided by 509 is 9 with a remainder of 99.
Use 9 as the next digit of our solution. 
Result so far: 5715.89
If we subtract 4581 from 4680, we get 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Advancing to step 10:
When dividing 990 by 509, we get 1 with a remainder of 481.
Put 1 as the next digit of the answer. 
Result so far: 5715.891
Subtract 509 from 990 to get 481.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4810, and continue the process.

Step 11:
If we divide 4810 by 509, we get 9 and a remainder of 229.
Put 9 as the next digit of the answer. 
Result so far: 5715.8919
Deduct 4581 from 4810 and we're left with 229.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

Going ahead to step 12:
2290 divided by 509 is 4 with a remainder of 254.
The number 4 becomes the next digit in our result. 
Result so far: 5715.89194
If we take 2036 away from 2290, we end up with 254.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

Advancing to step 13:
If we divide 2540 by 509, we get 4 and a remainder of 504.
Put 4 as the next digit of the answer. 
Result so far: 5715.891944
If we subtract 2036 from 2540, we get 504.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

The final outcome is 5715.891944, with a leftover of 5.04e-05.