We're dividing 143431 by 3 
We want to figure out the number of times 143431 can be divided by 3.

Going ahead to step 1:
3 goes into 1 0 times with 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.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 3

Let's proceed to step 2:
If we divide 14 by 3, we get 4 and a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we subtract 12 from 14, we get 2.
Include the next digit (3) from the dividend after 2, then repeat: 23 / 3

Step 3:
If we divide 23 by 3, we get 7 and a remainder of 2.
Record the quotient 7 as the next digit in the result. 
Result so far: 47.0
If we subtract 21 from 23, we get 2.
Grab the next digit (4) from the dividend, add it to 2, then carry on: 24 / 3

On to step 4:
The number 3 fits into 24 8 times, leaving a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 478.0
The remainder is 0 after subtracting 24 from 24.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 3

Advancing to step 5:
The number 3 fits into 3 1 times, leaving a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 4781.0
The remainder is 0 after subtracting 3 from 3.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 3

On to step 6:
3 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 47810.0
Deduct 0 from 1 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 7:
3 goes into 10 3 times with a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 47810.3
If we take 9 away from 10, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 8:
If we divide 10 by 3, we get 3 and a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 47810.33
The remainder is 1 after subtracting 9 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The quotient of the division is 47810.33, and the remainder is 0.001.