30357 ÷ 12 
We want to divide 30357 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
If we take 0 away from 3, we end up with 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 12

Going ahead to step 2:
12 can be fit into 30 2 times, resulting in a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 24 away from 30, we end up with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 12

Advancing to step 3:
63 divided by 12 is 5 with a remainder of 3.
Record the quotient 5 as the next digit in the result. 
Result so far: 25.0
If we subtract 60 from 63, we get 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 12

Advancing to step 4:
35 divided by 12 is 2 with a remainder of 11.
Put 2 as the next digit of the answer. 
Result so far: 252.0
The remainder is 11 after subtracting 24 from 35.
Take the next digit (7) from the dividend and append it to 11, then repeat: 117 / 12

Moving on to step 5:
12 goes into 117 9 times with a remainder of 9.
The number 9 becomes the next digit in our result. 
Result so far: 2529.0
Subtract 108 from 117 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 6:
12 can be fit into 90 7 times, resulting in a remainder of 6.
Use 7 as the next digit of our solution. 
Result so far: 2529.7
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 7:
12 can be fit into 60 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 2529.75
Subtract 60 from 60 to 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.

Going ahead to step 8:
12 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 2529.75
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
12 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 2529.75
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 2529.75, with a leftover of 0.0.