We look at the division of 428016 by 23 
The aim is to understand the frequency of 23 in 428016.

On to step 1:
23 goes into 4 0 times with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 23

Step 2:
When dividing 42 by 23, we get 1 with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 23 from 42 leaves us with 19.
Include the next digit (8) from the dividend after 19, then repeat: 198 / 23

Step 3:
When dividing 198 by 23, we get 8 with a remainder of 14.
Use 8 as the next digit of our solution. 
Result so far: 18.0
Subtract 184 from 198 to get 14.
Grab the next digit (0) from the dividend, add it to 14, then carry on: 140 / 23

Let's proceed to step 4:
The number 23 fits into 140 6 times, leaving a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 186.0
Subtract 138 from 140 to get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 23

Advancing to step 5:
The number 23 fits into 21 0 times, leaving a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 1860.0
If we take 0 away from 21, we end up with 21.
Grab the next digit (6) from the dividend, add it to 21, then carry on: 216 / 23

Step 6:
The number 23 fits into 216 9 times, leaving a remainder of 9.
The number 9 becomes the next digit in our result. 
Result so far: 18609.0
Subtract 207 from 216 to 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.

Going ahead to step 7:
When dividing 90 by 23, we get 3 with a remainder of 21.
Put 3 as the next digit of the answer. 
Result so far: 18609.3
If we take 69 away from 90, we end up 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.

On to step 8:
23 goes into 210 9 times with a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 18609.39
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.

On to step 9:
23 can be fit into 30 1 times, resulting in a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 18609.391
Deduct 23 from 30 and we're left 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.

Step 10:
If we divide 70 by 23, we get 3 and a remainder of 1.
The next digit of our result is 3. 
Result so far: 18609.3913
Deduct 69 from 70 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 11:
10 divided by 23 is 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 18609.3913
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 12:
The number 23 fits into 100 4 times, leaving a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 18609.391304
If we subtract 92 from 100, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 13:
The number 23 fits into 80 3 times, leaving a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 18609.3913043
The remainder is 11 after subtracting 69 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 14:
23 goes into 110 4 times with a remainder of 18.
Record the quotient 4 as the next digit in the result. 
Result so far: 18609.39130434
Subtract 92 from 110 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The final result is 18609.39130434 with a remainder of 1.8e-08.