We look at the division of 688684 by 72 
The aim is to understand the frequency of 72 in 688684.

Advancing to step 1:
72 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (8) from the dividend after 6, then repeat: 68 / 72

On to step 2:
If we divide 68 by 72, we get 0 and a remainder of 68.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 68 and we're left with 68.
Bring next digit (8) of the dividend behind the 68 and repeat the process: 688 / 72

Advancing to step 3:
If we divide 688 by 72, we get 9 and a remainder of 40.
Write down 9 as next digit of the result. 
Result so far: 9.0
Deduct 648 from 688 and we're left with 40.
Bring next digit (6) of the dividend behind the 40 and repeat the process: 406 / 72

Step 4:
72 goes into 406 5 times with a remainder of 46.
Record the quotient 5 as the next digit in the result. 
Result so far: 95.0
If we take 360 away from 406, we end up with 46.
Bring next digit (8) of the dividend behind the 46 and repeat the process: 468 / 72

Going ahead to step 5:
If we divide 468 by 72, we get 6 and a remainder of 36.
The next digit of our result is 6. 
Result so far: 956.0
The remainder is 36 after subtracting 432 from 468.
Bring next digit (4) of the dividend behind the 36 and repeat the process: 364 / 72

Let's proceed to step 6:
72 goes into 364 5 times with a remainder of 4.
Write down 5 as next digit of the result. 
Result so far: 9565.0
Deduct 360 from 364 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 7:
If we divide 40 by 72, we get 0 and a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 9565.0
If we subtract 0 from 40, 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 can be fit into 400 5 times, resulting in a remainder of 40.
Use 5 as the next digit of our solution. 
Result so far: 9565.05
Deduct 360 from 400 and we're left 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.

Going ahead to step 9:
If we divide 400 by 72, we get 5 and a remainder of 40.
The number 5 becomes the next digit in our result. 
Result so far: 9565.055
Deduct 360 from 400 and we're left 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.

The final outcome is 9565.055, with a leftover of 0.004.