We look at the division of 243567 by 23 
The aim is to understand the frequency of 23 in 243567.

On to step 1:
23 goes into 2 0 times with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 23

Step 2:
24 divided by 23 is 1 with a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 23 away from 24, we end up with 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 23

Step 3:
23 can be fit into 13 0 times, resulting in a remainder of 13.
Put 0 as the next digit of the answer. 
Result so far: 10.0
The remainder is 13 after subtracting 0 from 13.
Bring next digit (5) of the dividend behind the 13 and repeat the process: 135 / 23

On to step 4:
23 can be fit into 135 5 times, resulting in a remainder of 20.
Record the quotient 5 as the next digit in the result. 
Result so far: 105.0
Subtract 115 from 135 to get 20.
Append the next digit (6) from the dividend to 20 and continue with: 206 / 23

Going ahead to step 5:
23 can be fit into 206 8 times, resulting in a remainder of 22.
Record the quotient 8 as the next digit in the result. 
Result so far: 1058.0
If we take 184 away from 206, we end up with 22.
Fetch the next digit (7) from the dividend, attach it to 22 and continue: 227 / 23

Going ahead to step 6:
227 divided by 23 is 9 with a remainder of 20.
Record the quotient 9 as the next digit in the result. 
Result so far: 10589.0
Deduct 207 from 227 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 7:
The number 23 fits into 200 8 times, leaving a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 10589.8
Subtract 184 from 200 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 8:
23 can be fit into 160 6 times, resulting in a remainder of 22.
The next digit of our result is 6. 
Result so far: 10589.86
If we take 138 away from 160, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Going ahead to step 9:
23 can be fit into 220 9 times, resulting in a remainder of 13.
The next digit of our result is 9. 
Result so far: 10589.869
If we take 207 away from 220, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 10:
23 can be fit into 130 5 times, resulting in a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 10589.8695
If we take 115 away from 130, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 11:
When dividing 150 by 23, we get 6 with a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 10589.86956
If we subtract 138 from 150, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 12:
If we divide 120 by 23, we get 5 and a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 10589.869565
Subtract 115 from 120 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 13:
When dividing 50 by 23, we get 2 with a remainder of 4.
The next digit of our result is 2. 
Result so far: 10589.8695652
Subtracting 46 from 50 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 14:
The number 23 fits into 40 1 times, leaving a remainder of 17.
Write down 1 as next digit of the result. 
Result so far: 10589.86956521
Deduct 23 from 40 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

The final outcome is 10589.86956521, with a leftover of 1.7e-08.