299431 ÷ 12 
Let's see how many times 12 fits into 299431.

On to step 1:
12 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (9) from the dividend after 2, then repeat: 29 / 12

Moving on to step 2:
29 divided by 12 is 2 with a remainder of 5.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtract 24 from 29 to get 5.
Include the next digit (9) from the dividend after 5, then repeat: 59 / 12

Step 3:
The number 12 fits into 59 4 times, leaving a remainder of 11.
Put 4 as the next digit of the answer. 
Result so far: 24.0
The remainder is 11 after subtracting 48 from 59.
Fetch the next digit (4) from the dividend, attach it to 11 and continue: 114 / 12

Going ahead to step 4:
12 goes into 114 9 times with a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 249.0
Subtracting 108 from 114 leaves us with 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 12

Going ahead to step 5:
12 goes into 63 5 times with a remainder of 3.
Put 5 as the next digit of the answer. 
Result so far: 2495.0
Subtract 60 from 63 to get 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 12

Let's proceed to step 6:
If we divide 31 by 12, we get 2 and a remainder of 7.
The number 2 becomes the next digit in our result. 
Result so far: 24952.0
Subtract 24 from 31 to 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.

Step 7:
If we divide 70 by 12, we get 5 and a remainder of 10.
The next digit of our result is 5. 
Result so far: 24952.5
Subtract 60 from 70 to 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.

On to step 8:
100 divided by 12 is 8 with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 24952.58
If we take 96 away from 100, we end up 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.
Record the quotient 3 as the next digit in the result. 
Result so far: 24952.583
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.

On to step 10:
The number 12 fits into 40 3 times, leaving a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 24952.5833
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.

After the division, we end up with 24952.5833 and a remainder of 4e-05.