258001 ÷ 75 
The aim is to understand the frequency of 75 in 258001.

Step 1:
The number 75 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 75

Step 2:
75 can be fit into 25 0 times, resulting in a remainder of 25.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 25 to get 25.
Append the next digit (8) from the dividend to 25 and continue with: 258 / 75

Moving on to step 3:
75 goes into 258 3 times with a remainder of 33.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtracting 225 from 258 leaves us with 33.
Grab the next digit (0) from the dividend, add it to 33, then carry on: 330 / 75

Advancing to step 4:
330 divided by 75 is 4 with a remainder of 30.
Put 4 as the next digit of the answer. 
Result so far: 34.0
If we subtract 300 from 330, we get 30.
Fetch the next digit (0) from the dividend, attach it to 30 and continue: 300 / 75

Let's proceed to step 5:
300 divided by 75 is 4 with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 344.0
If we take 300 away from 300, we end up with 0.
Append the next digit (1) from the dividend to 0 and continue with: 1 / 75

Step 6:
The number 75 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 3440.0
Subtracting 0 from 1 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
If we divide 10 by 75, we get 0 and a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 3440.0
Deduct 0 from 10 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.

Step 8:
The number 75 fits into 100 1 times, leaving a remainder of 25.
The number 1 becomes the next digit in our result. 
Result so far: 3440.01
Subtracting 75 from 100 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.

Let's proceed to step 9:
75 can be fit into 250 3 times, resulting in a remainder of 25.
Record the quotient 3 as the next digit in the result. 
Result so far: 3440.013
If we take 225 away from 250, we end up 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.

Moving on to step 10:
The number 75 fits into 250 3 times, leaving a remainder of 25.
The next digit of our result is 3. 
Result so far: 3440.0133
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.

The final result is 3440.0133 with a remainder of 0.00025.