143983 ÷ 40 
Let's see how many times 40 fits into 143983.

Step 1:
The number 40 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 40

Moving on to step 2:
14 divided by 40 is 0 with a remainder of 14.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 14 after subtracting 0 from 14.
Include the next digit (3) from the dividend after 14, then repeat: 143 / 40

On to step 3:
40 goes into 143 3 times with a remainder of 23.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtract 120 from 143 to get 23.
Append the next digit (9) from the dividend to 23 and continue with: 239 / 40

Let's proceed to step 4:
40 goes into 239 5 times with a remainder of 39.
Use 5 as the next digit of our solution. 
Result so far: 35.0
If we take 200 away from 239, we end up with 39.
Grab the next digit (8) from the dividend, add it to 39, then carry on: 398 / 40

Advancing to step 5:
If we divide 398 by 40, we get 9 and a remainder of 38.
Use 9 as the next digit of our solution. 
Result so far: 359.0
If we subtract 360 from 398, we get 38.
Include the next digit (3) from the dividend after 38, then repeat: 383 / 40

Let's proceed to step 6:
The number 40 fits into 383 9 times, leaving a remainder of 23.
Put 9 as the next digit of the answer. 
Result so far: 3599.0
If we subtract 360 from 383, we get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 7:
The number 40 fits into 230 5 times, leaving a remainder of 30.
Put 5 as the next digit of the answer. 
Result so far: 3599.5
Subtract 200 from 230 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 8:
40 can be fit into 300 7 times, resulting in a remainder of 20.
The next digit of our result is 7. 
Result so far: 3599.57
Deduct 280 from 300 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
40 goes into 200 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 3599.575
Deduct 200 from 200 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 10:
40 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 3599.575
Subtract 0 from 0 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.

Moving on to step 11:
40 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 3599.575
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 3599.575 with a remaining 0.0.