We're dividing 386503 by 12 
We want to figure out the number of times 386503 can be divided by 12.

Advancing 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.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 12

Step 2:
12 can be fit into 38 3 times, resulting in a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 36 from 38 leaves us with 2.
Take the next digit (6) from the dividend and append it to 2, then repeat: 26 / 12

Advancing to step 3:
If we divide 26 by 12, we get 2 and a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 32.0
Subtract 24 from 26 to get 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 12

Moving on to step 4:
The number 12 fits into 25 2 times, leaving a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 322.0
Deduct 24 from 25 and we're left with 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 12

Advancing to step 5:
12 can be fit into 10 0 times, resulting in a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 3220.0
Subtracting 0 from 10 leaves us with 10.
Take the next digit (3) from the dividend and append it to 10, then repeat: 103 / 12

Going ahead to step 6:
12 can be fit into 103 8 times, resulting in a remainder of 7.
Write down 8 as next digit of the result. 
Result so far: 32208.0
Subtract 96 from 103 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 7:
If we divide 70 by 12, we get 5 and a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 32208.5
If we take 60 away from 70, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
The number 12 fits into 100 8 times, leaving a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 32208.58
If we subtract 96 from 100, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 9:
When dividing 40 by 12, we get 3 with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 32208.583
Subtracting 36 from 40 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 10:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 32208.5833
If we take 36 away from 40, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final outcome is 32208.5833, with a leftover of 4e-05.