65510319 ÷ 75 
The aim is to understand the frequency of 75 in 65510319.

On to step 1:
6 divided by 75 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (5) from the dividend, attach it to 6 and continue: 65 / 75

On to step 2:
The number 75 fits into 65 0 times, leaving a remainder of 65.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 65, we end up with 65.
Bring next digit (5) of the dividend behind the 65 and repeat the process: 655 / 75

Going ahead to step 3:
If we divide 655 by 75, we get 8 and a remainder of 55.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we take 600 away from 655, we end up with 55.
Append the next digit (1) from the dividend to 55 and continue with: 551 / 75

Let's proceed to step 4:
The number 75 fits into 551 7 times, leaving a remainder of 26.
Put 7 as the next digit of the answer. 
Result so far: 87.0
Deduct 525 from 551 and we're left with 26.
Fetch the next digit (0) from the dividend, attach it to 26 and continue: 260 / 75

Going ahead to step 5:
75 goes into 260 3 times with a remainder of 35.
The number 3 becomes the next digit in our result. 
Result so far: 873.0
The remainder is 35 after subtracting 225 from 260.
Include the next digit (3) from the dividend after 35, then repeat: 353 / 75

On to step 6:
75 can be fit into 353 4 times, resulting in a remainder of 53.
The number 4 becomes the next digit in our result. 
Result so far: 8734.0
If we subtract 300 from 353, we get 53.
Take the next digit (1) from the dividend and append it to 53, then repeat: 531 / 75

Going ahead to step 7:
75 goes into 531 7 times with a remainder of 6.
Put 7 as the next digit of the answer. 
Result so far: 87347.0
Deduct 525 from 531 and we're left with 6.
Fetch the next digit (9) from the dividend, attach it to 6 and continue: 69 / 75

Let's proceed to step 8:
75 goes into 69 0 times with a remainder of 69.
Write down 0 as next digit of the result. 
Result so far: 873470.0
Subtracting 0 from 69 leaves us with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 9:
The number 75 fits into 690 9 times, leaving a remainder of 15.
The number 9 becomes the next digit in our result. 
Result so far: 873470.9
Subtracting 675 from 690 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 10:
When dividing 150 by 75, we get 2 with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 873470.92
If we subtract 150 from 150, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 11:
0 divided by 75 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 873470.92
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 12:
When dividing 0 by 75, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 873470.92
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 873470.92, with a leftover of 0.0.