We're dividing 300242 by 75 
The aim is to understand the frequency of 75 in 300242.

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
Deduct 0 from 3 and we're left with 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 75

Step 2:
If we divide 30 by 75, we get 0 and a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 30, we get 30.
Append the next digit (0) from the dividend to 30 and continue with: 300 / 75

Going ahead to step 3:
When dividing 300 by 75, we get 4 with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
The remainder is 0 after subtracting 300 from 300.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 75

On to step 4:
When dividing 2 by 75, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 40.0
Deduct 0 from 2 and we're left with 2.
Grab the next digit (4) from the dividend, add it to 2, then carry on: 24 / 75

On to step 5:
24 divided by 75 is 0 with a remainder of 24.
Write down 0 as next digit of the result. 
Result so far: 400.0
If we subtract 0 from 24, we get 24.
Bring next digit (2) of the dividend behind the 24 and repeat the process: 242 / 75

On to step 6:
If we divide 242 by 75, we get 3 and a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 4003.0
If we subtract 225 from 242, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 7:
The number 75 fits into 170 2 times, leaving a remainder of 20.
Put 2 as the next digit of the answer. 
Result so far: 4003.2
Subtracting 150 from 170 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.

On to step 8:
The number 75 fits into 200 2 times, leaving a remainder of 50.
Put 2 as the next digit of the answer. 
Result so far: 4003.22
Deduct 150 from 200 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Our division results in 4003.22 with a remaining 0.05.