We look at the division of 641825 by 23 
The aim is to understand the frequency of 23 in 641825.

On to step 1:
23 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 23

Step 2:
If we divide 64 by 23, we get 2 and a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 46 from 64 and we're left with 18.
Grab the next digit (1) from the dividend, add it to 18, then carry on: 181 / 23

Moving on to step 3:
When dividing 181 by 23, we get 7 with a remainder of 20.
The number 7 becomes the next digit in our result. 
Result so far: 27.0
If we take 161 away from 181, we end up with 20.
Append the next digit (8) from the dividend to 20 and continue with: 208 / 23

On to step 4:
If we divide 208 by 23, we get 9 and a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 279.0
If we subtract 207 from 208, we get 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 23

On to step 5:
23 can be fit into 12 0 times, resulting in a remainder of 12.
The next digit of our result is 0. 
Result so far: 2790.0
The remainder is 12 after subtracting 0 from 12.
Append the next digit (5) from the dividend to 12 and continue with: 125 / 23

On to step 6:
The number 23 fits into 125 5 times, leaving a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 27905.0
The remainder is 10 after subtracting 115 from 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
23 goes into 100 4 times with a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 27905.4
Subtracting 92 from 100 leaves us 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.

Moving on to step 8:
23 can be fit into 80 3 times, resulting in a remainder of 11.
Write down 3 as next digit of the result. 
Result so far: 27905.43
If we subtract 69 from 80, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 9:
110 divided by 23 is 4 with a remainder of 18.
Put 4 as the next digit of the answer. 
Result so far: 27905.434
If we take 92 away from 110, we end up 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.

Step 10:
If we divide 180 by 23, we get 7 and a remainder of 19.
The number 7 becomes the next digit in our result. 
Result so far: 27905.4347
If we subtract 161 from 180, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 11:
The number 23 fits into 190 8 times, leaving a remainder of 6.
Use 8 as the next digit of our solution. 
Result so far: 27905.43478
The remainder is 6 after subtracting 184 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 12:
If we divide 60 by 23, we get 2 and a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 27905.434782
If we subtract 46 from 60, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 13:
23 goes into 140 6 times with a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 27905.4347826
The remainder is 2 after subtracting 138 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 14:
23 can be fit into 20 0 times, resulting in a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 27905.4347826
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

After the division, we end up with 27905.4347826 and a remainder of 2e-08.