640610 ÷ 75 
The aim is to understand the frequency of 75 in 640610.

On to step 1:
75 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 75

Advancing to step 2:
When dividing 64 by 75, we get 0 with a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 64 leaves us with 64.
Append the next digit (0) from the dividend to 64 and continue with: 640 / 75

Moving on to step 3:
75 goes into 640 8 times with a remainder of 40.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we take 600 away from 640, we end up with 40.
Include the next digit (6) from the dividend after 40, then repeat: 406 / 75

Going ahead to step 4:
75 goes into 406 5 times with a remainder of 31.
Record the quotient 5 as the next digit in the result. 
Result so far: 85.0
If we take 375 away from 406, we end up with 31.
Append the next digit (1) from the dividend to 31 and continue with: 311 / 75

Step 5:
311 divided by 75 is 4 with a remainder of 11.
Record the quotient 4 as the next digit in the result. 
Result so far: 854.0
Subtracting 300 from 311 leaves us with 11.
Grab the next digit (0) from the dividend, add it to 11, then carry on: 110 / 75

Going ahead to step 6:
The number 75 fits into 110 1 times, leaving a remainder of 35.
Record the quotient 1 as the next digit in the result. 
Result so far: 8541.0
If we subtract 75 from 110, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 7:
75 goes into 350 4 times with a remainder of 50.
Use 4 as the next digit of our solution. 
Result so far: 8541.4
Subtracting 300 from 350 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.

On to step 8:
When dividing 500 by 75, we get 6 with a remainder of 50.
The number 6 becomes the next digit in our result. 
Result so far: 8541.46
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.

Moving on to step 9:
If we divide 500 by 75, we get 6 and a remainder of 50.
Use 6 as the next digit of our solution. 
Result so far: 8541.466
Subtract 450 from 500 to 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 8541.466 and a remainder of 0.005.