We're dividing 515415 by 16 
The aim is to understand the frequency of 16 in 515415.

Step 1:
If we divide 5 by 16, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 16

On to step 2:
If we divide 51 by 16, we get 3 and a remainder of 3.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 48 from 51 and we're left with 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 16

On to step 3:
35 divided by 16 is 2 with a remainder of 3.
The next digit of our result is 2. 
Result so far: 32.0
The remainder is 3 after subtracting 32 from 35.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 16

Moving on to step 4:
If we divide 34 by 16, we get 2 and a remainder of 2.
Use 2 as the next digit of our solution. 
Result so far: 322.0
Deduct 32 from 34 and we're left with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 16

Moving on to step 5:
The number 16 fits into 21 1 times, leaving a remainder of 5.
Write down 1 as next digit of the result. 
Result so far: 3221.0
If we subtract 16 from 21, we get 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 16

On to step 6:
The number 16 fits into 55 3 times, leaving a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 32213.0
The remainder is 7 after subtracting 48 from 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 7:
16 goes into 70 4 times with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 32213.4
Deduct 64 from 70 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 8:
60 divided by 16 is 3 with a remainder of 12.
Put 3 as the next digit of the answer. 
Result so far: 32213.43
Subtracting 48 from 60 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 9:
16 goes into 120 7 times with a remainder of 8.
Put 7 as the next digit of the answer. 
Result so far: 32213.437
Subtract 112 from 120 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 10:
If we divide 80 by 16, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 32213.4375
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.

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: 32213.4375
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.

On to step 12:
0 divided by 16 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 32213.4375
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 final outcome is 32213.4375, with a leftover of 0.0.