We look at the division of 918021 by 23 
The aim is to understand the frequency of 23 in 918021.

On to step 1:
The number 23 fits into 9 0 times, leaving a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 23

Going ahead to step 2:
When dividing 91 by 23, we get 3 with a remainder of 22.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 69 from 91 and we're left with 22.
Fetch the next digit (8) from the dividend, attach it to 22 and continue: 228 / 23

Moving on to step 3:
228 divided by 23 is 9 with a remainder of 21.
Use 9 as the next digit of our solution. 
Result so far: 39.0
If we subtract 207 from 228, we get 21.
Grab the next digit (0) from the dividend, add it to 21, then carry on: 210 / 23

On to step 4:
23 goes into 210 9 times with a remainder of 3.
Record the quotient 9 as the next digit in the result. 
Result so far: 399.0
If we subtract 207 from 210, we get 3.
Take the next digit (2) from the dividend and append it to 3, then repeat: 32 / 23

Going ahead to step 5:
23 goes into 32 1 times with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 3991.0
If we subtract 23 from 32, we get 9.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 23

Moving on to step 6:
91 divided by 23 is 3 with a remainder of 22.
Record the quotient 3 as the next digit in the result. 
Result so far: 39913.0
If we subtract 69 from 91, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 7:
When dividing 220 by 23, we get 9 with a remainder of 13.
Put 9 as the next digit of the answer. 
Result so far: 39913.9
If we subtract 207 from 220, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 8:
If we divide 130 by 23, we get 5 and a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 39913.95
Deduct 115 from 130 and we're left 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.

On to step 9:
23 goes into 150 6 times with a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 39913.956
If we take 138 away from 150, we end up 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.

Let's proceed to step 10:
When dividing 120 by 23, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 39913.9565
The remainder is 5 after subtracting 115 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 11:
23 can be fit into 50 2 times, resulting in a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 39913.95652
Subtract 46 from 50 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 12:
40 divided by 23 is 1 with a remainder of 17.
The number 1 becomes the next digit in our result. 
Result so far: 39913.956521
If we subtract 23 from 40, we get 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 13:
170 divided by 23 is 7 with a remainder of 9.
The number 7 becomes the next digit in our result. 
Result so far: 39913.9565217
Deduct 161 from 170 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 14:
When dividing 90 by 23, we get 3 with a remainder of 21.
The number 3 becomes the next digit in our result. 
Result so far: 39913.95652173
The remainder is 21 after subtracting 69 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

The quotient of the division is 39913.95652173, and the remainder is 2.1e-08.