We look at the division of 142175 by 30 
The aim is to understand the frequency of 30 in 142175.

Going ahead to step 1:
1 divided by 30 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 30

Going ahead to step 2:
14 divided by 30 is 0 with a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 14 leaves us with 14.
Include the next digit (2) from the dividend after 14, then repeat: 142 / 30

Moving on to step 3:
30 goes into 142 4 times with a remainder of 22.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtract 120 from 142 to get 22.
Take the next digit (1) from the dividend and append it to 22, then repeat: 221 / 30

Moving on to step 4:
When dividing 221 by 30, we get 7 with a remainder of 11.
Record the quotient 7 as the next digit in the result. 
Result so far: 47.0
If we subtract 210 from 221, we get 11.
Include the next digit (7) from the dividend after 11, then repeat: 117 / 30

Advancing to step 5:
117 divided by 30 is 3 with a remainder of 27.
The next digit of our result is 3. 
Result so far: 473.0
If we take 90 away from 117, we end up with 27.
Fetch the next digit (5) from the dividend, attach it to 27 and continue: 275 / 30

Going ahead to step 6:
If we divide 275 by 30, we get 9 and a remainder of 5.
Put 9 as the next digit of the answer. 
Result so far: 4739.0
If we take 270 away from 275, we end up 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.

Advancing to step 7:
50 divided by 30 is 1 with a remainder of 20.
Write down 1 as next digit of the result. 
Result so far: 4739.1
The remainder is 20 after subtracting 30 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 8:
When dividing 200 by 30, we get 6 with a remainder of 20.
Put 6 as the next digit of the answer. 
Result so far: 4739.16
The remainder is 20 after subtracting 180 from 200.
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:
When dividing 200 by 30, we get 6 with a remainder of 20.
Put 6 as the next digit of the answer. 
Result so far: 4739.166
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.

Our division results in 4739.166 with a remaining 0.002.