590998 ÷ 75 
The aim is to understand the frequency of 75 in 590998.

Advancing to step 1:
5 divided by 75 is 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (9) from the dividend and append it to 5, then repeat: 59 / 75

Going ahead to step 2:
The number 75 fits into 59 0 times, leaving a remainder of 59.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 59 and we're left with 59.
Append the next digit (0) from the dividend to 59 and continue with: 590 / 75

Advancing to step 3:
75 can be fit into 590 7 times, resulting in a remainder of 65.
Write down 7 as next digit of the result. 
Result so far: 7.0
The remainder is 65 after subtracting 525 from 590.
Grab the next digit (9) from the dividend, add it to 65, then carry on: 659 / 75

Moving on to step 4:
When dividing 659 by 75, we get 8 with a remainder of 59.
Write down 8 as next digit of the result. 
Result so far: 78.0
The remainder is 59 after subtracting 600 from 659.
Append the next digit (9) from the dividend to 59 and continue with: 599 / 75

Moving on to step 5:
The number 75 fits into 599 7 times, leaving a remainder of 74.
Write down 7 as next digit of the result. 
Result so far: 787.0
Subtracting 525 from 599 leaves us with 74.
Grab the next digit (8) from the dividend, add it to 74, then carry on: 748 / 75

Moving on to step 6:
When dividing 748 by 75, we get 9 with a remainder of 73.
Write down 9 as next digit of the result. 
Result so far: 7879.0
Subtract 675 from 748 to get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Moving on to step 7:
When dividing 730 by 75, we get 9 with a remainder of 55.
Record the quotient 9 as the next digit in the result. 
Result so far: 7879.9
Subtract 675 from 730 to get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Let's proceed to step 8:
The number 75 fits into 550 7 times, leaving a remainder of 25.
The number 7 becomes the next digit in our result. 
Result so far: 7879.97
Subtract 525 from 550 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.

Moving on to step 9:
When dividing 250 by 75, we get 3 with a remainder of 25.
Use 3 as the next digit of our solution. 
Result so far: 7879.973
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.

Step 10:
75 can be fit into 250 3 times, resulting in a remainder of 25.
The next digit of our result is 3. 
Result so far: 7879.9733
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.

The final result is 7879.9733 with a remainder of 0.00025.