We divide 513568 by 30
The aim is to understand the frequency of 30 in 513568.

Step 1:
The number 30 fits into 5 0 times, leaving a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 30

On to step 2:
If we divide 51 by 30, we get 1 and a remainder of 21.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 30 from 51 leaves us with 21.
Include the next digit (3) from the dividend after 21, then repeat: 213 / 30

Advancing to step 3:
30 goes into 213 7 times with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 17.0
The remainder is 3 after subtracting 210 from 213.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 30

Going ahead to step 4:
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: 171.0
Subtract 30 from 35 to get 5.
Grab the next digit (6) from the dividend, add it to 5, then carry on: 56 / 30

Let's proceed to step 5:
56 divided by 30 is 1 with a remainder of 26.
Record the quotient 1 as the next digit in the result. 
Result so far: 1711.0
The remainder is 26 after subtracting 30 from 56.
Append the next digit (8) from the dividend to 26 and continue with: 268 / 30

Going ahead to step 6:
When dividing 268 by 30, we get 8 with a remainder of 28.
The next digit of our result is 8. 
Result so far: 17118.0
Subtracting 240 from 268 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 7:
The number 30 fits into 280 9 times, leaving a remainder of 10.
The next digit of our result is 9. 
Result so far: 17118.9
If we take 270 away from 280, 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 8:
If we divide 100 by 30, we get 3 and a remainder of 10.
Put 3 as the next digit of the answer. 
Result so far: 17118.93
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.

Moving on to step 9:
30 goes into 100 3 times with a remainder of 10.
Write down 3 as next digit of the result. 
Result so far: 17118.933
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.

The final result is 17118.933 with a remainder of 0.001.