We're dividing 660431 by 30 
The aim is to understand the frequency of 30 in 660431.

Moving on to step 1:
The number 30 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 30

Going ahead to step 2:
If we divide 66 by 30, we get 2 and a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 60 from 66 to get 6.
Take the next digit (0) from the dividend and append it to 6, then repeat: 60 / 30

Let's proceed to step 3:
60 divided by 30 is 2 with a remainder of 0.
The next digit of our result is 2. 
Result so far: 22.0
If we subtract 60 from 60, we get 0.
Grab the next digit (4) from the dividend, add it to 0, then carry on: 4 / 30

On to step 4:
30 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 220.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 30

On to step 5:
43 divided by 30 is 1 with a remainder of 13.
The next digit of our result is 1. 
Result so far: 2201.0
If we take 30 away from 43, we end up with 13.
Bring next digit (1) of the dividend behind the 13 and repeat the process: 131 / 30

Going ahead to step 6:
If we divide 131 by 30, we get 4 and a remainder of 11.
The next digit of our result is 4. 
Result so far: 22014.0
If we take 120 away from 131, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 7:
30 goes into 110 3 times with a remainder of 20.
Put 3 as the next digit of the answer. 
Result so far: 22014.3
Deduct 90 from 110 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 8:
30 can be fit into 200 6 times, resulting in a remainder of 20.
The next digit of our result is 6. 
Result so far: 22014.36
Subtract 180 from 200 to 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.

Moving on to step 9:
200 divided by 30 is 6 with a remainder of 20.
Put 6 as the next digit of the answer. 
Result so far: 22014.366
If we take 180 away from 200, we end up 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.

The final result is 22014.366 with a remainder of 0.002.