We divide 485742 by 12
We're looking to find how many times 12 goes into 485742.

Moving on to step 1:
12 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Fetch the next digit (8) from the dividend, attach it to 4 and continue: 48 / 12

Advancing to step 2:
12 goes into 48 4 times with a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 48 away from 48, we end up with 0.
Fetch the next digit (5) from the dividend, attach it to 0 and continue: 5 / 12

Advancing to step 3:
12 goes into 5 0 times with a remainder of 5.
The next digit of our result is 0. 
Result so far: 40.0
If we take 0 away from 5, we end up with 5.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 12

Advancing to step 4:
When dividing 57 by 12, we get 4 with a remainder of 9.
Record the quotient 4 as the next digit in the result. 
Result so far: 404.0
Deduct 48 from 57 and we're left with 9.
Bring next digit (4) of the dividend behind the 9 and repeat the process: 94 / 12

Let's proceed to step 5:
If we divide 94 by 12, we get 7 and a remainder of 10.
Write down 7 as next digit of the result. 
Result so far: 4047.0
If we take 84 away from 94, we end up with 10.
Include the next digit (2) from the dividend after 10, then repeat: 102 / 12

Going ahead to step 6:
12 goes into 102 8 times with a remainder of 6.
Use 8 as the next digit of our solution. 
Result so far: 40478.0
If we take 96 away from 102, we end up 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.

Advancing to step 7:
12 can be fit into 60 5 times, resulting in a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 40478.5
If we subtract 60 from 60, we 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 8:
The number 12 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 40478.5
If we subtract 0 from 0, we 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 9:
0 divided by 12 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 40478.5
If we subtract 0 from 0, we 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.

The final outcome is 40478.5, with a leftover of 0.0.