We're dividing 644172 by 16 
The aim is to understand the frequency of 16 in 644172.

Let's proceed to step 1:
6 divided by 16 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 16

Moving on to step 2:
When dividing 64 by 16, we get 4 with a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 64 from 64 and we're left with 0.
Grab the next digit (4) from the dividend, add it to 0, then carry on: 4 / 16

On to step 3:
When dividing 4 by 16, we get 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 40.0
If we take 0 away from 4, we end up with 4.
Fetch the next digit (1) from the dividend, attach it to 4 and continue: 41 / 16

On to step 4:
When dividing 41 by 16, we get 2 with a remainder of 9.
The number 2 becomes the next digit in our result. 
Result so far: 402.0
If we subtract 32 from 41, we get 9.
Take the next digit (7) from the dividend and append it to 9, then repeat: 97 / 16

On to step 5:
16 goes into 97 6 times with a remainder of 1.
The number 6 becomes the next digit in our result. 
Result so far: 4026.0
If we subtract 96 from 97, we get 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 16

Step 6:
16 can be fit into 12 0 times, resulting in a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 40260.0
If we subtract 0 from 12, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 7:
16 goes into 120 7 times with a remainder of 8.
The number 7 becomes the next digit in our result. 
Result so far: 40260.7
The remainder is 8 after subtracting 112 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 8:
16 can be fit into 80 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 40260.75
Subtracting 80 from 80 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
If we divide 0 by 16, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 40260.75
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
When dividing 0 by 16, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 40260.75
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 40260.75 with a remainder of 0.0.