We look at the division of 12015 by 51 
The aim is to understand the frequency of 51 in 12015.

Moving on to step 1:
The number 51 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 51

Let's proceed to step 2:
51 goes into 12 0 times with a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Grab the next digit (0) from the dividend, add it to 12, then carry on: 120 / 51

Advancing to step 3:
When dividing 120 by 51, we get 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 102 from 120, we get 18.
Append the next digit (1) from the dividend to 18 and continue with: 181 / 51

Moving on to step 4:
51 can be fit into 181 3 times, resulting in a remainder of 28.
Put 3 as the next digit of the answer. 
Result so far: 23.0
Deduct 153 from 181 and we're left with 28.
Grab the next digit (5) from the dividend, add it to 28, then carry on: 285 / 51

Advancing to step 5:
51 can be fit into 285 5 times, resulting in a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 235.0
The remainder is 30 after subtracting 255 from 285.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 6:
51 goes into 300 5 times with a remainder of 45.
Use 5 as the next digit of our solution. 
Result so far: 235.5
The remainder is 45 after subtracting 255 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Let's proceed to step 7:
51 can be fit into 450 8 times, resulting in a remainder of 42.
The next digit of our result is 8. 
Result so far: 235.58
If we take 408 away from 450, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 8:
When dividing 420 by 51, we get 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 235.588
If we take 408 away from 420, we end up 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.

Our division results in 235.588 with a remaining 0.0012.