We look at the division of 87959 by 75 
The aim is to understand the frequency of 75 in 87959.

Advancing to step 1:
8 divided by 75 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 75

Moving on to step 2:
If we divide 87 by 75, we get 1 and a remainder of 12.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 75 from 87, we get 12.
Bring next digit (9) of the dividend behind the 12 and repeat the process: 129 / 75

Advancing to step 3:
The number 75 fits into 129 1 times, leaving a remainder of 54.
Put 1 as the next digit of the answer. 
Result so far: 11.0
If we subtract 75 from 129, we get 54.
Include the next digit (5) from the dividend after 54, then repeat: 545 / 75

Moving on to step 4:
The number 75 fits into 545 7 times, leaving a remainder of 20.
Use 7 as the next digit of our solution. 
Result so far: 117.0
The remainder is 20 after subtracting 525 from 545.
Bring next digit (9) of the dividend behind the 20 and repeat the process: 209 / 75

On to step 5:
The number 75 fits into 209 2 times, leaving a remainder of 59.
Write down 2 as next digit of the result. 
Result so far: 1172.0
If we take 150 away from 209, we end up with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Step 6:
590 divided by 75 is 7 with a remainder of 65.
The next digit of our result is 7. 
Result so far: 1172.7
Deduct 525 from 590 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 7:
The number 75 fits into 650 8 times, leaving a remainder of 50.
Record the quotient 8 as the next digit in the result. 
Result so far: 1172.78
If we subtract 600 from 650, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 8:
When dividing 500 by 75, we get 6 with a remainder of 50.
Put 6 as the next digit of the answer. 
Result so far: 1172.786
If we subtract 450 from 500, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 9:
The number 75 fits into 500 6 times, leaving a remainder of 50.
Record the quotient 6 as the next digit in the result. 
Result so far: 1172.7866
Deduct 450 from 500 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.

The final result is 1172.7866 with a remainder of 0.0005.