431855 ÷ 30 
The aim is to understand the frequency of 30 in 431855.

Let's proceed to step 1:
When dividing 4 by 30, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 30

On to step 2:
When dividing 43 by 30, we get 1 with a remainder of 13.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 30 from 43 leaves us with 13.
Take the next digit (1) from the dividend and append it to 13, then repeat: 131 / 30

Advancing to step 3:
The number 30 fits into 131 4 times, leaving a remainder of 11.
Put 4 as the next digit of the answer. 
Result so far: 14.0
The remainder is 11 after subtracting 120 from 131.
Include the next digit (8) from the dividend after 11, then repeat: 118 / 30

Going ahead to step 4:
118 divided by 30 is 3 with a remainder of 28.
Write down 3 as next digit of the result. 
Result so far: 143.0
If we take 90 away from 118, we end up with 28.
Take the next digit (5) from the dividend and append it to 28, then repeat: 285 / 30

Let's proceed to step 5:
When dividing 285 by 30, we get 9 with a remainder of 15.
Put 9 as the next digit of the answer. 
Result so far: 1439.0
If we take 270 away from 285, we end up with 15.
Fetch the next digit (5) from the dividend, attach it to 15 and continue: 155 / 30

Step 6:
30 can be fit into 155 5 times, resulting in a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 14395.0
Subtracting 150 from 155 leaves us 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.

Going ahead to step 7:
30 can be fit into 50 1 times, resulting in a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 14395.1
Deduct 30 from 50 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.

Let's proceed to step 8:
30 goes into 200 6 times with a remainder of 20.
Write down 6 as next digit of the result. 
Result so far: 14395.16
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.

Let's proceed to step 9:
The number 30 fits into 200 6 times, leaving a remainder of 20.
The number 6 becomes the next digit in our result. 
Result so far: 14395.166
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.

The final outcome is 14395.166, with a leftover of 0.002.