405184 ÷ 12 
Let's see how many times 12 fits into 405184.

Moving on to step 1:
If we divide 4 by 12, we get 0 and a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 12

Advancing to step 2:
40 divided by 12 is 3 with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtracting 36 from 40 leaves us with 4.
Fetch the next digit (5) from the dividend, attach it to 4 and continue: 45 / 12

On to step 3:
45 divided by 12 is 3 with a remainder of 9.
Record the quotient 3 as the next digit in the result. 
Result so far: 33.0
The remainder is 9 after subtracting 36 from 45.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 12

Moving on to step 4:
91 divided by 12 is 7 with a remainder of 7.
Put 7 as the next digit of the answer. 
Result so far: 337.0
Subtracting 84 from 91 leaves us with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 12

Advancing to step 5:
12 can be fit into 78 6 times, resulting in a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 3376.0
Subtracting 72 from 78 leaves us with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 12

Step 6:
If we divide 64 by 12, we get 5 and a remainder of 4.
Record the quotient 5 as the next digit in the result. 
Result so far: 33765.0
If we subtract 60 from 64, 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.

Advancing to step 7:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 33765.3
If we subtract 36 from 40, 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.

Step 8:
If we divide 40 by 12, we get 3 and a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 33765.33
Subtract 36 from 40 to 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.

Our division results in 33765.33 with a remaining 0.004.