We're dividing 124209 by 23 
The aim is to understand the frequency of 23 in 124209.

Advancing to step 1:
The number 23 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 23

Let's proceed to step 2:
23 goes into 12 0 times with a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Include the next digit (4) from the dividend after 12, then repeat: 124 / 23

Moving on to step 3:
When dividing 124 by 23, we get 5 with a remainder of 9.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we take 115 away from 124, we end up with 9.
Include the next digit (2) from the dividend after 9, then repeat: 92 / 23

Going ahead to step 4:
23 goes into 92 4 times with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 54.0
If we take 92 away from 92, we end up with 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 23

Moving on to step 5:
23 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 540.0
The remainder is 0 after subtracting 0 from 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 23

Step 6:
23 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 5400.0
If we subtract 0 from 9, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 7:
The number 23 fits into 90 3 times, leaving a remainder of 21.
Put 3 as the next digit of the answer. 
Result so far: 5400.3
Deduct 69 from 90 and we're left with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 8:
23 goes into 210 9 times with a remainder of 3.
The next digit of our result is 9. 
Result so far: 5400.39
If we subtract 207 from 210, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 9:
23 goes into 30 1 times with a remainder of 7.
The next digit of our result is 1. 
Result so far: 5400.391
Subtracting 23 from 30 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 10:
70 divided by 23 is 3 with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 5400.3913
If we subtract 69 from 70, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 11:
23 can be fit into 10 0 times, resulting in a remainder of 10.
The next digit of our result is 0. 
Result so far: 5400.3913
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 12:
100 divided by 23 is 4 with a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 5400.391304
Deduct 92 from 100 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 13:
23 can be fit into 80 3 times, resulting in a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 5400.3913043
Deduct 69 from 80 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 14:
23 can be fit into 110 4 times, resulting in a remainder of 18.
Put 4 as the next digit of the answer. 
Result so far: 5400.39130434
Subtracting 92 from 110 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

In conclusion, the division gives 5400.39130434 with a balance of 1.8e-08.