143240 divided by 12 
We want to divide 143240 by 12.

Step 1:
12 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (4) from the dividend after 1, then repeat: 14 / 12

On to step 2:
14 divided by 12 is 1 with a remainder of 2.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 12 from 14, we get 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 12

On to step 3:
12 can be fit into 23 1 times, resulting in a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
Deduct 12 from 23 and we're left with 11.
Fetch the next digit (2) from the dividend, attach it to 11 and continue: 112 / 12

Let's proceed to step 4:
12 can be fit into 112 9 times, resulting in a remainder of 4.
Put 9 as the next digit of the answer. 
Result so far: 119.0
Subtract 108 from 112 to get 4.
Fetch the next digit (4) from the dividend, attach it to 4 and continue: 44 / 12

On to step 5:
When dividing 44 by 12, we get 3 with a remainder of 8.
Use 3 as the next digit of our solution. 
Result so far: 1193.0
If we take 36 away from 44, we end up with 8.
Bring next digit (0) of the dividend behind the 8 and repeat the process: 80 / 12

Step 6:
The number 12 fits into 80 6 times, leaving a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 11936.0
Subtracting 72 from 80 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 7:
The number 12 fits into 80 6 times, leaving a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 11936.6
Deduct 72 from 80 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 8:
80 divided by 12 is 6 with a remainder of 8.
The next digit of our result is 6. 
Result so far: 11936.66
The remainder is 8 after subtracting 72 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final result is 11936.66 with a remainder of 0.008.