We look at the division of 457139 by 30 
The aim is to understand the frequency of 30 in 457139.

Going ahead to step 1:
30 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 30

Let's proceed to step 2:
45 divided by 30 is 1 with a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 30 from 45 to get 15.
Bring next digit (7) of the dividend behind the 15 and repeat the process: 157 / 30

Step 3:
157 divided by 30 is 5 with a remainder of 7.
The next digit of our result is 5. 
Result so far: 15.0
Subtracting 150 from 157 leaves us with 7.
Include the next digit (1) from the dividend after 7, then repeat: 71 / 30

Let's proceed to step 4:
When dividing 71 by 30, we get 2 with a remainder of 11.
Use 2 as the next digit of our solution. 
Result so far: 152.0
If we take 60 away from 71, we end up with 11.
Include the next digit (3) from the dividend after 11, then repeat: 113 / 30

Going ahead to step 5:
The number 30 fits into 113 3 times, leaving a remainder of 23.
The number 3 becomes the next digit in our result. 
Result so far: 1523.0
Subtract 90 from 113 to get 23.
Take the next digit (9) from the dividend and append it to 23, then repeat: 239 / 30

Advancing to step 6:
239 divided by 30 is 7 with a remainder of 29.
Put 7 as the next digit of the answer. 
Result so far: 15237.0
Subtract 210 from 239 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 7:
When dividing 290 by 30, we get 9 with a remainder of 20.
Write down 9 as next digit of the result. 
Result so far: 15237.9
Subtracting 270 from 290 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.

Going ahead to step 8:
If we divide 200 by 30, we get 6 and a remainder of 20.
Use 6 as the next digit of our solution. 
Result so far: 15237.96
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:
If we divide 200 by 30, we get 6 and a remainder of 20.
Use 6 as the next digit of our solution. 
Result so far: 15237.966
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.

Our division results in 15237.966 with a remaining 0.002.