We look at the division of 810923 by 30 
The aim is to understand the frequency of 30 in 810923.

Advancing to step 1:
The number 30 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 30

Going ahead to step 2:
If we divide 81 by 30, we get 2 and a remainder of 21.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 60 from 81 leaves us with 21.
Append the next digit (0) from the dividend to 21 and continue with: 210 / 30

Advancing to step 3:
30 goes into 210 7 times with a remainder of 0.
The next digit of our result is 7. 
Result so far: 27.0
Subtract 210 from 210 to get 0.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 30

On to step 4:
When dividing 9 by 30, we get 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 270.0
Subtract 0 from 9 to get 9.
Append the next digit (2) from the dividend to 9 and continue with: 92 / 30

On to step 5:
If we divide 92 by 30, we get 3 and a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 2703.0
The remainder is 2 after subtracting 90 from 92.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 30

Let's proceed to step 6:
If we divide 23 by 30, we get 0 and a remainder of 23.
Write down 0 as next digit of the result. 
Result so far: 27030.0
Deduct 0 from 23 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 7:
230 divided by 30 is 7 with a remainder of 20.
The next digit of our result is 7. 
Result so far: 27030.7
The remainder is 20 after subtracting 210 from 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 8:
30 goes into 200 6 times with a remainder of 20.
The next digit of our result is 6. 
Result so far: 27030.76
If we subtract 180 from 200, we 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.

Step 9:
30 goes into 200 6 times with a remainder of 20.
Write down 6 as next digit of the result. 
Result so far: 27030.766
If we subtract 180 from 200, we 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.

The final result is 27030.766 with a remainder of 0.002.