660928 ÷ 72 
The aim is to understand the frequency of 72 in 660928.

Step 1:
If we divide 6 by 72, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
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

Step 2:
When dividing 66 by 72, we get 0 with a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Append the next digit (0) from the dividend to 66 and continue with: 660 / 72

Let's proceed to step 3:
72 goes into 660 9 times with a remainder of 12.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtracting 648 from 660 leaves us with 12.
Grab the next digit (9) from the dividend, add it to 12, then carry on: 129 / 72

Going ahead to step 4:
The number 72 fits into 129 1 times, leaving a remainder of 57.
Write down 1 as next digit of the result. 
Result so far: 91.0
Subtracting 72 from 129 leaves us with 57.
Append the next digit (2) from the dividend to 57 and continue with: 572 / 72

On to step 5:
72 can be fit into 572 7 times, resulting in a remainder of 68.
The next digit of our result is 7. 
Result so far: 917.0
Subtract 504 from 572 to get 68.
Append the next digit (8) from the dividend to 68 and continue with: 688 / 72

Let's proceed to step 6:
If we divide 688 by 72, we get 9 and a remainder of 40.
Use 9 as the next digit of our solution. 
Result so far: 9179.0
If we take 648 away from 688, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 7:
When dividing 400 by 72, we get 5 with a remainder of 40.
Record the quotient 5 as the next digit in the result. 
Result so far: 9179.5
If we subtract 360 from 400, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 8:
72 goes into 400 5 times with a remainder of 40.
Use 5 as the next digit of our solution. 
Result so far: 9179.55
The remainder is 40 after subtracting 360 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The quotient of the division is 9179.55, and the remainder is 0.04.