215865 ÷ 16 
The aim is to understand the frequency of 16 in 215865.

On to step 1:
The number 16 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 16

On to step 2:
16 can be fit into 21 1 times, resulting in a remainder of 5.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 16 from 21 to get 5.
Append the next digit (5) from the dividend to 5 and continue with: 55 / 16

Let's proceed to step 3:
16 can be fit into 55 3 times, resulting in a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we subtract 48 from 55, we get 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 16

Let's proceed to step 4:
The number 16 fits into 78 4 times, leaving a remainder of 14.
Write down 4 as next digit of the result. 
Result so far: 134.0
If we subtract 64 from 78, we get 14.
Append the next digit (6) from the dividend to 14 and continue with: 146 / 16

Moving on to step 5:
146 divided by 16 is 9 with a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 1349.0
If we subtract 144 from 146, we get 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 16

Moving on to step 6:
16 goes into 25 1 times with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 13491.0
If we subtract 16 from 25, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 7:
When dividing 90 by 16, we get 5 with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 13491.5
If we take 80 away from 90, we end up 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.

On to step 8:
When dividing 100 by 16, we get 6 with a remainder of 4.
The next digit of our result is 6. 
Result so far: 13491.56
Subtract 96 from 100 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 9:
The number 16 fits into 40 2 times, leaving a remainder of 8.
The next digit of our result is 2. 
Result so far: 13491.562
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.

Moving on to step 10:
80 divided by 16 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 13491.5625
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.

Moving on to step 11:
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: 13491.5625
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.

Step 12:
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: 13491.5625
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.

After the division, we end up with 13491.5625 and a remainder of 0.0.