We look at the division of 30104509 by 75 
The aim is to understand the frequency of 75 in 30104509.

Going ahead to step 1:
When dividing 3 by 75, we get 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 75

Let's proceed to step 2:
When dividing 30 by 75, we get 0 with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 30 after subtracting 0 from 30.
Take the next digit (1) from the dividend and append it to 30, then repeat: 301 / 75

Moving on to step 3:
301 divided by 75 is 4 with a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtracting 300 from 301 leaves us with 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 75

Advancing to step 4:
When dividing 10 by 75, we get 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
Deduct 0 from 10 and we're left with 10.
Grab the next digit (4) from the dividend, add it to 10, then carry on: 104 / 75

Let's proceed to step 5:
When dividing 104 by 75, we get 1 with a remainder of 29.
The number 1 becomes the next digit in our result. 
Result so far: 401.0
Subtracting 75 from 104 leaves us with 29.
Fetch the next digit (5) from the dividend, attach it to 29 and continue: 295 / 75

Moving on to step 6:
If we divide 295 by 75, we get 3 and a remainder of 70.
Put 3 as the next digit of the answer. 
Result so far: 4013.0
Subtracting 225 from 295 leaves us with 70.
Grab the next digit (0) from the dividend, add it to 70, then carry on: 700 / 75

Going ahead to step 7:
If we divide 700 by 75, we get 9 and a remainder of 25.
Record the quotient 9 as the next digit in the result. 
Result so far: 40139.0
If we subtract 675 from 700, we get 25.
Bring next digit (9) of the dividend behind the 25 and repeat the process: 259 / 75

Let's proceed to step 8:
The number 75 fits into 259 3 times, leaving a remainder of 34.
Use 3 as the next digit of our solution. 
Result so far: 401393.0
If we subtract 225 from 259, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 9:
75 goes into 340 4 times with a remainder of 40.
Put 4 as the next digit of the answer. 
Result so far: 401393.4
Subtracting 300 from 340 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 10:
If we divide 400 by 75, we get 5 and a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 401393.45
Subtracting 375 from 400 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 11:
75 goes into 250 3 times with a remainder of 25.
Use 3 as the next digit of our solution. 
Result so far: 401393.453
Subtracting 225 from 250 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 12:
The number 75 fits into 250 3 times, leaving a remainder of 25.
The number 3 becomes the next digit in our result. 
Result so far: 401393.4533
Subtract 225 from 250 to 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.

After the division, we end up with 401393.4533 and a remainder of 0.00025.