We look at the division of 485215 by 12 
Our goal is to divide 485215 by 12.

Let's proceed to step 1:
12 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Include the next digit (8) from the dividend after 4, then repeat: 48 / 12

Moving on to step 2:
If we divide 48 by 12, we get 4 and a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 0 after subtracting 48 from 48.
Fetch the next digit (5) from the dividend, attach it to 0 and continue: 5 / 12

Going ahead to step 3:
12 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 40.0
Deduct 0 from 5 and we're left with 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 12

Step 4:
The number 12 fits into 52 4 times, leaving a remainder of 4.
The next digit of our result is 4. 
Result so far: 404.0
The remainder is 4 after subtracting 48 from 52.
Take the next digit (1) from the dividend and append it to 4, then repeat: 41 / 12

Step 5:
The number 12 fits into 41 3 times, leaving a remainder of 5.
Record the quotient 3 as the next digit in the result. 
Result so far: 4043.0
Subtracting 36 from 41 leaves us with 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 12

Let's proceed to step 6:
55 divided by 12 is 4 with a remainder of 7.
The number 4 becomes the next digit in our result. 
Result so far: 40434.0
If we subtract 48 from 55, we 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.

Advancing to step 7:
12 goes into 70 5 times with a remainder of 10.
The next digit of our result is 5. 
Result so far: 40434.5
Deduct 60 from 70 and we're left 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:
When dividing 100 by 12, we get 8 with a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 40434.58
Subtracting 96 from 100 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.

Step 9:
The number 12 fits into 40 3 times, leaving a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 40434.583
Deduct 36 from 40 and we're left 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.

Moving on to step 10:
The number 12 fits into 40 3 times, leaving a remainder of 4.
The next digit of our result is 3. 
Result so far: 40434.5833
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.

The final result is 40434.5833 with a remainder of 4e-05.