390189 divided by 12 
We want to figure out the number of times 390189 can be divided by 12.

On to step 1:
12 can be fit into 3 0 times, resulting in a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 12

Step 2:
39 divided by 12 is 3 with a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 36 from 39 and we're left with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 12

On to step 3:
The number 12 fits into 30 2 times, leaving a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 32.0
The remainder is 6 after subtracting 24 from 30.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 12

On to step 4:
12 goes into 61 5 times with a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 325.0
Subtracting 60 from 61 leaves us with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 12

Going ahead to step 5:
When dividing 18 by 12, we get 1 with a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 3251.0
The remainder is 6 after subtracting 12 from 18.
Append the next digit (9) from the dividend to 6 and continue with: 69 / 12

Moving on to step 6:
12 goes into 69 5 times with a remainder of 9.
Write down 5 as next digit of the result. 
Result so far: 32515.0
Subtracting 60 from 69 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
If we divide 90 by 12, we get 7 and a remainder of 6.
The number 7 becomes the next digit in our result. 
Result so far: 32515.7
Subtracting 84 from 90 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 8:
The number 12 fits into 60 5 times, leaving a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 32515.75
The remainder is 0 after subtracting 60 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
When dividing 0 by 12, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 32515.75
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
12 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 32515.75
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.

In conclusion, the division gives 32515.75 with a balance of 0.0.