We're dividing 528644 by 72 
The aim is to understand the frequency of 72 in 528644.

Let's proceed to step 1:
If we divide 5 by 72, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (2) from the dividend, add it to 5, then carry on: 52 / 72

On to step 2:
72 goes into 52 0 times with a remainder of 52.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 52 after subtracting 0 from 52.
Bring next digit (8) of the dividend behind the 52 and repeat the process: 528 / 72

On to step 3:
528 divided by 72 is 7 with a remainder of 24.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
The remainder is 24 after subtracting 504 from 528.
Append the next digit (6) from the dividend to 24 and continue with: 246 / 72

On to step 4:
72 goes into 246 3 times with a remainder of 30.
The number 3 becomes the next digit in our result. 
Result so far: 73.0
The remainder is 30 after subtracting 216 from 246.
Take the next digit (4) from the dividend and append it to 30, then repeat: 304 / 72

Advancing to step 5:
72 can be fit into 304 4 times, resulting in a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 734.0
The remainder is 16 after subtracting 288 from 304.
Append the next digit (4) from the dividend to 16 and continue with: 164 / 72

On to step 6:
72 goes into 164 2 times with a remainder of 20.
Put 2 as the next digit of the answer. 
Result so far: 7342.0
Subtract 144 from 164 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 7:
72 can be fit into 200 2 times, resulting in a remainder of 56.
The number 2 becomes the next digit in our result. 
Result so far: 7342.2
If we subtract 144 from 200, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Moving on to step 8:
72 can be fit into 560 7 times, resulting in a remainder of 56.
The number 7 becomes the next digit in our result. 
Result so far: 7342.27
The remainder is 56 after subtracting 504 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 9:
The number 72 fits into 560 7 times, leaving a remainder of 56.
Put 7 as the next digit of the answer. 
Result so far: 7342.277
If we subtract 504 from 560, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

After the division, we end up with 7342.277 and a remainder of 0.0056.