We're dividing 644805 by 16 
The aim is to understand the frequency of 16 in 644805.

Let's proceed to step 1:
16 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 16

Going ahead to step 2:
If we divide 64 by 16, we get 4 and a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we subtract 64 from 64, we get 0.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 16

Going ahead to step 3:
16 can be fit into 4 0 times, resulting in a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 40.0
If we subtract 0 from 4, we get 4.
Include the next digit (8) from the dividend after 4, then repeat: 48 / 16

Let's proceed to step 4:
16 goes into 48 3 times with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 403.0
If we subtract 48 from 48, we get 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 16

Step 5:
0 divided by 16 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 4030.0
Subtracting 0 from 0 leaves us with 0.
Grab the next digit (5) from the dividend, add it to 0, then carry on: 5 / 16

Step 6:
If we divide 5 by 16, we get 0 and a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 40300.0
If we subtract 0 from 5, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 7:
16 goes into 50 3 times with a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 40300.3
Subtract 48 from 50 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 8:
16 can be fit into 20 1 times, resulting in a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 40300.31
Deduct 16 from 20 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.

Advancing to step 9:
If we divide 40 by 16, we get 2 and a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 40300.312
The remainder is 8 after subtracting 32 from 40.
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 10:
16 goes into 80 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 40300.3125
Subtract 80 from 80 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.

Going ahead to step 11:
The number 16 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 40300.3125
Deduct 0 from 0 and we're left 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 12:
The number 16 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 40300.3125
If we subtract 0 from 0, we 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 quotient of the division is 40300.3125, and the remainder is 0.0.