We look at the division of 878567 by 12 
The aim is to understand the frequency of 12 in 878567.

On to step 1:
When dividing 8 by 12, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 12

Advancing to step 2:
12 can be fit into 87 7 times, resulting in a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 7.0
Subtracting 84 from 87 leaves us with 3.
Grab the next digit (8) from the dividend, add it to 3, then carry on: 38 / 12

Let's proceed to step 3:
38 divided by 12 is 3 with a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 73.0
Deduct 36 from 38 and we're left with 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 12

Going ahead to step 4:
If we divide 25 by 12, we get 2 and a remainder of 1.
The next digit of our result is 2. 
Result so far: 732.0
If we subtract 24 from 25, we get 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 12

Moving on to step 5:
When dividing 16 by 12, we get 1 with a remainder of 4.
The next digit of our result is 1. 
Result so far: 7321.0
The remainder is 4 after subtracting 12 from 16.
Take the next digit (7) from the dividend and append it to 4, then repeat: 47 / 12

Let's proceed to step 6:
When dividing 47 by 12, we get 3 with a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 73213.0
Subtract 36 from 47 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 7:
12 goes into 110 9 times with a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 73213.9
If we subtract 108 from 110, 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.

Going ahead to step 8:
If we divide 20 by 12, we get 1 and a remainder of 8.
The next digit of our result is 1. 
Result so far: 73213.91
Subtract 12 from 20 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.

Moving on to step 9:
80 divided by 12 is 6 with a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 73213.916
Deduct 72 from 80 and we're left 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.

Step 10:
The number 12 fits into 80 6 times, leaving a remainder of 8.
The next digit of our result is 6. 
Result so far: 73213.9166
Deduct 72 from 80 and we're left 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.

After the division, we end up with 73213.9166 and a remainder of 8e-05.