486415 ÷ 12 
We want to figure out the number of times 486415 can be divided by 12.

Step 1:
If we divide 4 by 12, we get 0 and a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Fetch the next digit (8) from the dividend, attach it to 4 and continue: 48 / 12

Advancing to step 2:
12 can be fit into 48 4 times, resulting in a remainder of 0.
The next digit of our result is 4. 
Result so far: 4.0
Subtract 48 from 48 to get 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 12

Going ahead to step 3:
12 can be fit into 6 0 times, resulting in a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 40.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 12

Step 4:
64 divided by 12 is 5 with a remainder of 4.
Use 5 as the next digit of our solution. 
Result so far: 405.0
If we take 60 away from 64, we end up with 4.
Fetch the next digit (1) from the dividend, attach it to 4 and continue: 41 / 12

Going ahead to step 5:
12 can be fit into 41 3 times, resulting in a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 4053.0
Subtract 36 from 41 to get 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 12

Going ahead to step 6:
12 can be fit into 55 4 times, resulting in a remainder of 7.
The number 4 becomes the next digit in our result. 
Result so far: 40534.0
If we take 48 away from 55, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 7:
If we divide 70 by 12, we get 5 and a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 40534.5
If we subtract 60 from 70, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
When dividing 100 by 12, we get 8 with a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 40534.58
The remainder is 4 after subtracting 96 from 100.
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 9:
12 can be fit into 40 3 times, resulting in a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 40534.583
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.

Step 10:
The number 12 fits into 40 3 times, leaving a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 40534.5833
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.

The final result is 40534.5833 with a remainder of 4e-05.