We look at the division of 872290 by 23 
The aim is to understand the frequency of 23 in 872290.

Step 1:
8 divided by 23 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 23

On to step 2:
The number 23 fits into 87 3 times, leaving a remainder of 18.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 69 from 87 and we're left with 18.
Append the next digit (2) from the dividend to 18 and continue with: 182 / 23

On to step 3:
The number 23 fits into 182 7 times, leaving a remainder of 21.
Write down 7 as next digit of the result. 
Result so far: 37.0
The remainder is 21 after subtracting 161 from 182.
Append the next digit (2) from the dividend to 21 and continue with: 212 / 23

Let's proceed to step 4:
23 can be fit into 212 9 times, resulting in a remainder of 5.
Write down 9 as next digit of the result. 
Result so far: 379.0
If we take 207 away from 212, we end up with 5.
Grab the next digit (9) from the dividend, add it to 5, then carry on: 59 / 23

Going ahead to step 5:
If we divide 59 by 23, we get 2 and a remainder of 13.
Put 2 as the next digit of the answer. 
Result so far: 3792.0
The remainder is 13 after subtracting 46 from 59.
Grab the next digit (0) from the dividend, add it to 13, then carry on: 130 / 23

On to step 6:
The number 23 fits into 130 5 times, leaving a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 37925.0
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.

Moving on to step 7:
150 divided by 23 is 6 with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 37925.6
Subtracting 138 from 150 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 8:
When dividing 120 by 23, we get 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 37925.65
Deduct 115 from 120 and we're left with 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 9:
50 divided by 23 is 2 with a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 37925.652
Deduct 46 from 50 and we're left 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.

On to step 10:
40 divided by 23 is 1 with a remainder of 17.
The next digit of our result is 1. 
Result so far: 37925.6521
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.

Advancing to step 11:
The number 23 fits into 170 7 times, leaving a remainder of 9.
Record the quotient 7 as the next digit in the result. 
Result so far: 37925.65217
The remainder is 9 after subtracting 161 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 12:
The number 23 fits into 90 3 times, leaving a remainder of 21.
Use 3 as the next digit of our solution. 
Result so far: 37925.652173
If we subtract 69 from 90, we get 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 13:
210 divided by 23 is 9 with a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 37925.6521739
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 14:
23 goes into 30 1 times with a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 37925.65217391
Subtracting 23 from 30 leaves us 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.

After the division, we end up with 37925.65217391 and a remainder of 7e-09.