748172 ÷ 75 
The aim is to understand the frequency of 75 in 748172.

On to step 1:
The number 75 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Include the next digit (4) from the dividend after 7, then repeat: 74 / 75

Step 2:
75 can be fit into 74 0 times, resulting in a remainder of 74.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 74 to get 74.
Include the next digit (8) from the dividend after 74, then repeat: 748 / 75

Step 3:
When dividing 748 by 75, we get 9 with a remainder of 73.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Subtract 675 from 748 to get 73.
Append the next digit (1) from the dividend to 73 and continue with: 731 / 75

Going ahead to step 4:
75 goes into 731 9 times with a remainder of 56.
The next digit of our result is 9. 
Result so far: 99.0
Subtract 675 from 731 to get 56.
Grab the next digit (7) from the dividend, add it to 56, then carry on: 567 / 75

Moving on to step 5:
75 goes into 567 7 times with a remainder of 42.
Write down 7 as next digit of the result. 
Result so far: 997.0
Deduct 525 from 567 and we're left with 42.
Grab the next digit (2) from the dividend, add it to 42, then carry on: 422 / 75

Step 6:
When dividing 422 by 75, we get 5 with a remainder of 47.
The number 5 becomes the next digit in our result. 
Result so far: 9975.0
The remainder is 47 after subtracting 375 from 422.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Moving on to step 7:
75 can be fit into 470 6 times, resulting in a remainder of 20.
The next digit of our result is 6. 
Result so far: 9975.6
If we subtract 450 from 470, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 8:
If we divide 200 by 75, we get 2 and a remainder of 50.
Put 2 as the next digit of the answer. 
Result so far: 9975.62
If we subtract 150 from 200, 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:
500 divided by 75 is 6 with a remainder of 50.
The next digit of our result is 6. 
Result so far: 9975.626
Subtracting 450 from 500 leaves us 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.

Step 10:
The number 75 fits into 500 6 times, leaving a remainder of 50.
The next digit of our result is 6. 
Result so far: 9975.6266
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.

After the division, we end up with 9975.6266 and a remainder of 0.0005.