We look at the division of 345345 by 23 
The aim is to understand the frequency of 23 in 345345.

Step 1:
When dividing 3 by 23, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 23

Let's proceed to step 2:
The number 23 fits into 34 1 times, leaving a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 23 from 34 to get 11.
Bring next digit (5) of the dividend behind the 11 and repeat the process: 115 / 23

Let's proceed to step 3:
When dividing 115 by 23, we get 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 15.0
Subtract 115 from 115 to get 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 23

Going ahead to step 4:
When dividing 3 by 23, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 150.0
Subtract 0 from 3 to get 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 23

Going ahead to step 5:
The number 23 fits into 34 1 times, leaving a remainder of 11.
Use 1 as the next digit of our solution. 
Result so far: 1501.0
The remainder is 11 after subtracting 23 from 34.
Bring next digit (5) of the dividend behind the 11 and repeat the process: 115 / 23

On to step 6:
The number 23 fits into 115 5 times, leaving a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 15015.0
The remainder is 0 after subtracting 115 from 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
23 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 15015.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
0 divided by 23 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 15015.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 15015.0, with a leftover of 0.0.