143800 divided by 12 
We're looking to find how many times 12 goes into 143800.

Step 1:
If we divide 1 by 12, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (4) from the dividend, add it to 1, then carry on: 14 / 12

Advancing to step 2:
If we divide 14 by 12, we get 1 and a remainder of 2.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 12 from 14, we get 2.
Bring next digit (3) of the dividend behind the 2 and repeat the process: 23 / 12

Let's proceed to step 3:
If we divide 23 by 12, we get 1 and a remainder of 11.
Write down 1 as next digit of the result. 
Result so far: 11.0
Deduct 12 from 23 and we're left with 11.
Take the next digit (8) from the dividend and append it to 11, then repeat: 118 / 12

On to step 4:
12 can be fit into 118 9 times, resulting in a remainder of 10.
The next digit of our result is 9. 
Result so far: 119.0
If we subtract 108 from 118, we get 10.
Bring next digit (0) of the dividend behind the 10 and repeat the process: 100 / 12

Going ahead to step 5:
12 goes into 100 8 times with a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 1198.0
If we subtract 96 from 100, we get 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 12

Moving on to step 6:
If we divide 40 by 12, we get 3 and a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 11983.0
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.

On to step 7:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 11983.3
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.

Let's proceed to step 8:
40 divided by 12 is 3 with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 11983.33
The remainder is 4 after subtracting 36 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

In conclusion, the division gives 11983.33 with a balance of 0.004.