We look at the division of 857760 by 72 
The aim is to understand the frequency of 72 in 857760.

On to step 1:
The number 72 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 72

Step 2:
72 can be fit into 85 1 times, resulting in a remainder of 13.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 72 from 85, we get 13.
Include the next digit (7) from the dividend after 13, then repeat: 137 / 72

On to step 3:
If we divide 137 by 72, we get 1 and a remainder of 65.
Use 1 as the next digit of our solution. 
Result so far: 11.0
Deduct 72 from 137 and we're left with 65.
Grab the next digit (7) from the dividend, add it to 65, then carry on: 657 / 72

Advancing to step 4:
72 can be fit into 657 9 times, resulting in a remainder of 9.
The next digit of our result is 9. 
Result so far: 119.0
If we take 648 away from 657, we end up with 9.
Take the next digit (6) from the dividend and append it to 9, then repeat: 96 / 72

Going ahead to step 5:
96 divided by 72 is 1 with a remainder of 24.
Write down 1 as next digit of the result. 
Result so far: 1191.0
If we subtract 72 from 96, we get 24.
Append the next digit (0) from the dividend to 24 and continue with: 240 / 72

Step 6:
If we divide 240 by 72, we get 3 and a remainder of 24.
Write down 3 as next digit of the result. 
Result so far: 11913.0
Subtracting 216 from 240 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 7:
72 can be fit into 240 3 times, resulting in a remainder of 24.
Write down 3 as next digit of the result. 
Result so far: 11913.3
The remainder is 24 after subtracting 216 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 8:
The number 72 fits into 240 3 times, leaving a remainder of 24.
The next digit of our result is 3. 
Result so far: 11913.33
Subtract 216 from 240 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The quotient of the division is 11913.33, and the remainder is 0.024.