18978125 ÷ 12 
The aim is to understand the frequency of 12 in 18978125.

Moving on to step 1:
If we divide 1 by 12, we get 0 and a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (8) from the dividend after 1, then repeat: 18 / 12

Going ahead to step 2:
The number 12 fits into 18 1 times, leaving a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 12 from 18 leaves us with 6.
Take the next digit (9) from the dividend and append it to 6, then repeat: 69 / 12

Advancing to step 3:
The number 12 fits into 69 5 times, leaving a remainder of 9.
Write down 5 as next digit of the result. 
Result so far: 15.0
Subtract 60 from 69 to get 9.
Include the next digit (7) from the dividend after 9, then repeat: 97 / 12

On to step 4:
If we divide 97 by 12, we get 8 and a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 158.0
Subtract 96 from 97 to get 1.
Include the next digit (8) from the dividend after 1, then repeat: 18 / 12

Advancing to step 5:
When dividing 18 by 12, we get 1 with a remainder of 6.
The next digit of our result is 1. 
Result so far: 1581.0
Subtract 12 from 18 to get 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 12

Advancing to step 6:
When dividing 61 by 12, we get 5 with a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 15815.0
If we subtract 60 from 61, we get 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 12

Let's proceed to step 7:
12 goes into 12 1 times with a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 158151.0
If we take 12 away from 12, we end up with 0.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 12

Going ahead to step 8:
12 can be fit into 5 0 times, resulting in a remainder of 5.
The next digit of our result is 0. 
Result so far: 1581510.0
Subtract 0 from 5 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 9:
50 divided by 12 is 4 with a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 1581510.4
If we subtract 48 from 50, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 10:
20 divided by 12 is 1 with a remainder of 8.
Put 1 as the next digit of the answer. 
Result so far: 1581510.41
Subtracting 12 from 20 leaves us with 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 11:
80 divided by 12 is 6 with a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 1581510.416
If we take 72 away from 80, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 12:
12 goes into 80 6 times with a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 1581510.4166
Subtracting 72 from 80 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 1581510.4166, with a leftover of 8e-05.