Let's divide 640923 by 30
The aim is to understand the frequency of 30 in 640923.

Advancing to step 1:
6 divided by 30 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 30

Going ahead to step 2:
30 goes into 64 2 times with a remainder of 4.
The next digit of our result is 2. 
Result so far: 2.0
If we take 60 away from 64, we end up with 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 30

Moving on to step 3:
If we divide 40 by 30, we get 1 and a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 21.0
The remainder is 10 after subtracting 30 from 40.
Include the next digit (9) from the dividend after 10, then repeat: 109 / 30

Step 4:
When dividing 109 by 30, we get 3 with a remainder of 19.
The next digit of our result is 3. 
Result so far: 213.0
If we take 90 away from 109, we end up with 19.
Include the next digit (2) from the dividend after 19, then repeat: 192 / 30

Going ahead to step 5:
192 divided by 30 is 6 with a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 2136.0
Subtracting 180 from 192 leaves us with 12.
Take the next digit (3) from the dividend and append it to 12, then repeat: 123 / 30

Going ahead to step 6:
If we divide 123 by 30, we get 4 and a remainder of 3.
The next digit of our result is 4. 
Result so far: 21364.0
The remainder is 3 after subtracting 120 from 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 7:
If we divide 30 by 30, we get 1 and a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 21364.1
Subtracting 30 from 30 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
When dividing 0 by 30, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 21364.1
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
When dividing 0 by 30, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 21364.1
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 21364.1 and a remainder of 0.0.