We're dividing 321428 by 16 
The aim is to understand the frequency of 16 in 321428.

Step 1:
When dividing 3 by 16, we get 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Grab the next digit (2) from the dividend, add it to 3, then carry on: 32 / 16

Moving on to step 2:
16 goes into 32 2 times with a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 32 from 32 leaves us with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 16

Going ahead to step 3:
16 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 20.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (4) from the dividend after 1, then repeat: 14 / 16

Let's proceed to step 4:
If we divide 14 by 16, we get 0 and a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 200.0
Subtracting 0 from 14 leaves us with 14.
Grab the next digit (2) from the dividend, add it to 14, then carry on: 142 / 16

Step 5:
16 goes into 142 8 times with a remainder of 14.
Use 8 as the next digit of our solution. 
Result so far: 2008.0
Subtract 128 from 142 to get 14.
Bring next digit (8) of the dividend behind the 14 and repeat the process: 148 / 16

Going ahead to step 6:
16 goes into 148 9 times with a remainder of 4.
Put 9 as the next digit of the answer. 
Result so far: 20089.0
Deduct 144 from 148 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 7:
The number 16 fits into 40 2 times, leaving a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 20089.2
Subtract 32 from 40 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 8:
80 divided by 16 is 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 20089.25
Deduct 80 from 80 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 9:
The number 16 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 20089.25
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.

On to step 10:
The number 16 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 20089.25
If we take 0 away from 0, 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.

The quotient of the division is 20089.25, and the remainder is 0.0.