Let's divide 721144 by 18
The aim is to understand the frequency of 18 in 721144.

Going ahead to step 1:
18 can be fit into 7 0 times, resulting in a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 18

Let's proceed to step 2:
72 divided by 18 is 4 with a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 72 from 72 to get 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 18

On to step 3:
The number 18 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 18

On to step 4:
18 can be fit into 11 0 times, resulting in a remainder of 11.
The number 0 becomes the next digit in our result. 
Result so far: 400.0
Deduct 0 from 11 and we're left with 11.
Append the next digit (4) from the dividend to 11 and continue with: 114 / 18

Step 5:
18 can be fit into 114 6 times, resulting in a remainder of 6.
Write down 6 as next digit of the result. 
Result so far: 4006.0
Subtract 108 from 114 to get 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 18

Advancing to step 6:
64 divided by 18 is 3 with a remainder of 10.
Write down 3 as next digit of the result. 
Result so far: 40063.0
If we subtract 54 from 64, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 7:
18 can be fit into 100 5 times, resulting in a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 40063.5
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
18 can be fit into 100 5 times, resulting in a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 40063.55
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 40063.55 with a remaining 0.01.