We look at the division of 518268 by 72 
The aim is to understand the frequency of 72 in 518268.

Moving on to step 1:
The number 72 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 72

Advancing to step 2:
If we divide 51 by 72, we get 0 and a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 51 and we're left with 51.
Bring next digit (8) of the dividend behind the 51 and repeat the process: 518 / 72

Let's proceed to step 3:
When dividing 518 by 72, we get 7 with a remainder of 14.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we subtract 504 from 518, we get 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 72

Let's proceed to step 4:
When dividing 142 by 72, we get 1 with a remainder of 70.
Record the quotient 1 as the next digit in the result. 
Result so far: 71.0
Subtracting 72 from 142 leaves us with 70.
Take the next digit (6) from the dividend and append it to 70, then repeat: 706 / 72

Moving on to step 5:
72 goes into 706 9 times with a remainder of 58.
The number 9 becomes the next digit in our result. 
Result so far: 719.0
Deduct 648 from 706 and we're left with 58.
Include the next digit (8) from the dividend after 58, then repeat: 588 / 72

On to step 6:
The number 72 fits into 588 8 times, leaving a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 7198.0
Deduct 576 from 588 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 7:
If we divide 120 by 72, we get 1 and a remainder of 48.
Record the quotient 1 as the next digit in the result. 
Result so far: 7198.1
If we take 72 away from 120, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 8:
480 divided by 72 is 6 with a remainder of 48.
Put 6 as the next digit of the answer. 
Result so far: 7198.16
If we take 432 away from 480, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 9:
If we divide 480 by 72, we get 6 and a remainder of 48.
Put 6 as the next digit of the answer. 
Result so far: 7198.166
If we take 432 away from 480, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

After the division, we end up with 7198.166 and a remainder of 0.0048.