We're dividing 538216 by 12 
The aim is to understand the frequency of 12 in 538216.

Step 1:
If we divide 5 by 12, we get 0 and a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 12

Going ahead to step 2:
12 goes into 53 4 times with a remainder of 5.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 48 from 53, we get 5.
Append the next digit (8) from the dividend to 5 and continue with: 58 / 12

Advancing to step 3:
12 can be fit into 58 4 times, resulting in a remainder of 10.
Put 4 as the next digit of the answer. 
Result so far: 44.0
If we subtract 48 from 58, we get 10.
Bring next digit (2) of the dividend behind the 10 and repeat the process: 102 / 12

Moving on to step 4:
12 goes into 102 8 times with a remainder of 6.
Write down 8 as next digit of the result. 
Result so far: 448.0
Subtract 96 from 102 to get 6.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 12

Step 5:
12 goes into 61 5 times with a remainder of 1.
Use 5 as the next digit of our solution. 
Result so far: 4485.0
The remainder is 1 after subtracting 60 from 61.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 12

Going ahead to step 6:
If we divide 16 by 12, we get 1 and a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 44851.0
Subtract 12 from 16 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.

Let's proceed to step 7:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 44851.3
Subtracting 36 from 40 leaves us 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.

Moving on to step 8:
When dividing 40 by 12, we get 3 with a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 44851.33
Deduct 36 from 40 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.

The final outcome is 44851.33, with a leftover of 0.004.