We're dividing 381128 by 30 
The aim is to understand the frequency of 30 in 381128.

Step 1:
If we divide 3 by 30, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 30

Moving on to step 2:
38 divided by 30 is 1 with a remainder of 8.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 30 from 38 to get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 30

On to step 3:
When dividing 81 by 30, we get 2 with a remainder of 21.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 60 from 81 and we're left with 21.
Take the next digit (1) from the dividend and append it to 21, then repeat: 211 / 30

Going ahead to step 4:
30 can be fit into 211 7 times, resulting in a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 127.0
Subtracting 210 from 211 leaves us with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 30

Moving on to step 5:
When dividing 12 by 30, we get 0 with a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 1270.0
Deduct 0 from 12 and we're left with 12.
Fetch the next digit (8) from the dividend, attach it to 12 and continue: 128 / 30

Going ahead to step 6:
If we divide 128 by 30, we get 4 and a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 12704.0
Deduct 120 from 128 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 7:
30 can be fit into 80 2 times, resulting in a remainder of 20.
Record the quotient 2 as the next digit in the result. 
Result so far: 12704.2
Subtracting 60 from 80 leaves us 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.

On to step 8:
30 can be fit into 200 6 times, resulting in a remainder of 20.
The number 6 becomes the next digit in our result. 
Result so far: 12704.26
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:
If we divide 200 by 30, we get 6 and a remainder of 20.
The number 6 becomes the next digit in our result. 
Result so far: 12704.266
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.

Our division results in 12704.266 with a remaining 0.002.