We look at the division of 350245 by 30 
The aim is to understand the frequency of 30 in 350245.

Step 1:
When dividing 3 by 30, we get 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 30

Moving on to step 2:
30 goes into 35 1 times with a remainder of 5.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 30 from 35 and we're left with 5.
Grab the next digit (0) from the dividend, add it to 5, then carry on: 50 / 30

Let's proceed to step 3:
50 divided by 30 is 1 with a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
Subtract 30 from 50 to get 20.
Include the next digit (2) from the dividend after 20, then repeat: 202 / 30

Going ahead to step 4:
The number 30 fits into 202 6 times, leaving a remainder of 22.
The next digit of our result is 6. 
Result so far: 116.0
Deduct 180 from 202 and we're left with 22.
Append the next digit (4) from the dividend to 22 and continue with: 224 / 30

Advancing to step 5:
224 divided by 30 is 7 with a remainder of 14.
Record the quotient 7 as the next digit in the result. 
Result so far: 1167.0
If we subtract 210 from 224, we get 14.
Fetch the next digit (5) from the dividend, attach it to 14 and continue: 145 / 30

Moving on to step 6:
The number 30 fits into 145 4 times, leaving a remainder of 25.
Use 4 as the next digit of our solution. 
Result so far: 11674.0
If we subtract 120 from 145, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 7:
250 divided by 30 is 8 with a remainder of 10.
The next digit of our result is 8. 
Result so far: 11674.8
Subtract 240 from 250 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
30 goes into 100 3 times with a remainder of 10.
Put 3 as the next digit of the answer. 
Result so far: 11674.83
Subtract 90 from 100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
The number 30 fits into 100 3 times, leaving a remainder of 10.
Write down 3 as next digit of the result. 
Result so far: 11674.833
Deduct 90 from 100 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.

The final result is 11674.833 with a remainder of 0.001.