111912 ÷ 15 
The aim is to understand the frequency of 15 in 111912.

On to step 1:
When dividing 1 by 15, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Include the next digit (1) from the dividend after 1, then repeat: 11 / 15

Let's proceed to step 2:
11 divided by 15 is 0 with a remainder of 11.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 11 to get 11.
Take the next digit (1) from the dividend and append it to 11, then repeat: 111 / 15

On to step 3:
If we divide 111 by 15, we get 7 and a remainder of 6.
Write down 7 as next digit of the result. 
Result so far: 7.0
The remainder is 6 after subtracting 105 from 111.
Take the next digit (9) from the dividend and append it to 6, then repeat: 69 / 15

Let's proceed to step 4:
69 divided by 15 is 4 with a remainder of 9.
The number 4 becomes the next digit in our result. 
Result so far: 74.0
Subtract 60 from 69 to get 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 15

Step 5:
15 can be fit into 91 6 times, resulting in a remainder of 1.
The number 6 becomes the next digit in our result. 
Result so far: 746.0
The remainder is 1 after subtracting 90 from 91.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 15

Going ahead to step 6:
15 goes into 12 0 times with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 7460.0
Subtract 0 from 12 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 7:
When dividing 120 by 15, we get 8 with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 7460.8
The remainder is 0 after subtracting 120 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
15 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 7460.8
The remainder is 0 after subtracting 0 from 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 9:
If we divide 0 by 15, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 7460.8
Deduct 0 from 0 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.

The quotient of the division is 7460.8, and the remainder is 0.0.