We look at the division of 428356 by 30 
The aim is to understand the frequency of 30 in 428356.

On to step 1:
The number 30 fits into 4 0 times, leaving a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 30

Moving on to step 2:
If we divide 42 by 30, we get 1 and a remainder of 12.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 30 from 42 leaves us with 12.
Append the next digit (8) from the dividend to 12 and continue with: 128 / 30

Going ahead to step 3:
The number 30 fits into 128 4 times, leaving a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 14.0
The remainder is 8 after subtracting 120 from 128.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 30

Moving on to step 4:
When dividing 83 by 30, we get 2 with a remainder of 23.
Put 2 as the next digit of the answer. 
Result so far: 142.0
The remainder is 23 after subtracting 60 from 83.
Bring next digit (5) of the dividend behind the 23 and repeat the process: 235 / 30

Step 5:
235 divided by 30 is 7 with a remainder of 25.
Put 7 as the next digit of the answer. 
Result so far: 1427.0
If we subtract 210 from 235, we get 25.
Take the next digit (6) from the dividend and append it to 25, then repeat: 256 / 30

On to step 6:
256 divided by 30 is 8 with a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 14278.0
If we subtract 240 from 256, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 7:
The number 30 fits into 160 5 times, leaving a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 14278.5
Deduct 150 from 160 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
30 can be fit into 100 3 times, resulting in a remainder of 10.
The next digit of our result is 3. 
Result so far: 14278.53
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 9:
If we divide 100 by 30, we get 3 and a remainder of 10.
The next digit of our result is 3. 
Result so far: 14278.533
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 14278.533 with a remaining 0.001.