We're dividing 643574 by 23 
The aim is to understand the frequency of 23 in 643574.

On to step 1:
23 goes into 6 0 times with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 23

Let's proceed to step 2:
23 goes into 64 2 times with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 46 from 64 leaves us with 18.
Append the next digit (3) from the dividend to 18 and continue with: 183 / 23

Moving on to step 3:
When dividing 183 by 23, we get 7 with a remainder of 22.
Put 7 as the next digit of the answer. 
Result so far: 27.0
Subtracting 161 from 183 leaves us with 22.
Fetch the next digit (5) from the dividend, attach it to 22 and continue: 225 / 23

Let's proceed to step 4:
23 can be fit into 225 9 times, resulting in a remainder of 18.
Record the quotient 9 as the next digit in the result. 
Result so far: 279.0
Subtracting 207 from 225 leaves us with 18.
Take the next digit (7) from the dividend and append it to 18, then repeat: 187 / 23

On to step 5:
187 divided by 23 is 8 with a remainder of 3.
The next digit of our result is 8. 
Result so far: 2798.0
Subtracting 184 from 187 leaves us with 3.
Include the next digit (4) from the dividend after 3, then repeat: 34 / 23

Let's proceed to step 6:
When dividing 34 by 23, we get 1 with a remainder of 11.
Put 1 as the next digit of the answer. 
Result so far: 27981.0
The remainder is 11 after subtracting 23 from 34.
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 7:
110 divided by 23 is 4 with a remainder of 18.
Use 4 as the next digit of our solution. 
Result so far: 27981.4
If we subtract 92 from 110, we 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.

Going ahead to step 8:
180 divided by 23 is 7 with a remainder of 19.
The number 7 becomes the next digit in our result. 
Result so far: 27981.47
Subtracting 161 from 180 leaves us with 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 9:
If we divide 190 by 23, we get 8 and a remainder of 6.
Use 8 as the next digit of our solution. 
Result so far: 27981.478
If we take 184 away from 190, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 10:
23 can be fit into 60 2 times, resulting in a remainder of 14.
Put 2 as the next digit of the answer. 
Result so far: 27981.4782
Deduct 46 from 60 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 11:
When dividing 140 by 23, we get 6 with a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 27981.47826
If we subtract 138 from 140, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 12:
23 goes into 20 0 times with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 27981.47826
Deduct 0 from 20 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 13:
If we divide 200 by 23, we get 8 and a remainder of 16.
The number 8 becomes the next digit in our result. 
Result so far: 27981.4782608
If we subtract 184 from 200, we 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.

Let's proceed to step 14:
The number 23 fits into 160 6 times, leaving a remainder of 22.
The number 6 becomes the next digit in our result. 
Result so far: 27981.47826086
Deduct 138 from 160 and we're left 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.

Our division results in 27981.47826086 with a remaining 2.2e-08.