We're dividing 81900884 by 16 
The aim is to understand the frequency of 16 in 81900884.

Let's proceed to step 1:
When dividing 8 by 16, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 16

Going ahead to step 2:
81 divided by 16 is 5 with a remainder of 1.
The next digit of our result is 5. 
Result so far: 5.0
Subtract 80 from 81 to get 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 16

Advancing to step 3:
If we divide 19 by 16, we get 1 and a remainder of 3.
The next digit of our result is 1. 
Result so far: 51.0
Subtracting 16 from 19 leaves us with 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 16

Let's proceed to step 4:
16 can be fit into 30 1 times, resulting in a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 511.0
Deduct 16 from 30 and we're left with 14.
Append the next digit (0) from the dividend to 14 and continue with: 140 / 16

Let's proceed to step 5:
If we divide 140 by 16, we get 8 and a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 5118.0
Subtract 128 from 140 to get 12.
Include the next digit (8) from the dividend after 12, then repeat: 128 / 16

Moving on to step 6:
16 can be fit into 128 8 times, resulting in a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 51188.0
Subtract 128 from 128 to get 0.
Grab the next digit (8) from the dividend, add it to 0, then carry on: 8 / 16

On to step 7:
8 divided by 16 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 511880.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (4) from the dividend, add it to 8, then carry on: 84 / 16

On to step 8:
16 can be fit into 84 5 times, resulting in a remainder of 4.
Use 5 as the next digit of our solution. 
Result so far: 5118805.0
The remainder is 4 after subtracting 80 from 84.
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 9:
40 divided by 16 is 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 5118805.2
Deduct 32 from 40 and we're left with 8.
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:
When dividing 80 by 16, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 5118805.25
If we take 80 away from 80, we end up 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.

Going ahead to step 11:
16 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 5118805.25
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:
16 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 5118805.25
The remainder is 0 after subtracting 0 from 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 5118805.25 with a remainder of 0.0.