We're dividing 66128 by 72 
The aim is to understand the frequency of 72 in 66128.

Step 1:
If we divide 6 by 72, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 72

Let's proceed to step 2:
The number 72 fits into 66 0 times, leaving a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Include the next digit (1) from the dividend after 66, then repeat: 661 / 72

Step 3:
If we divide 661 by 72, we get 9 and a remainder of 13.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
The remainder is 13 after subtracting 648 from 661.
Bring next digit (2) of the dividend behind the 13 and repeat the process: 132 / 72

On to step 4:
132 divided by 72 is 1 with a remainder of 60.
Record the quotient 1 as the next digit in the result. 
Result so far: 91.0
Subtracting 72 from 132 leaves us with 60.
Fetch the next digit (8) from the dividend, attach it to 60 and continue: 608 / 72

Advancing to step 5:
The number 72 fits into 608 8 times, leaving a remainder of 32.
The next digit of our result is 8. 
Result so far: 918.0
Subtract 576 from 608 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 6:
320 divided by 72 is 4 with a remainder of 32.
Put 4 as the next digit of the answer. 
Result so far: 918.4
If we take 288 away from 320, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 7:
The number 72 fits into 320 4 times, leaving a remainder of 32.
The number 4 becomes the next digit in our result. 
Result so far: 918.44
The remainder is 32 after subtracting 288 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

The final result is 918.44 with a remainder of 0.032.