431870 divided by 3 
Our goal is to divide 431870 by 3.

On to step 1:
3 can be fit into 4 1 times, resulting in a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 1 after subtracting 3 from 4.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 3

Advancing to step 2:
3 can be fit into 13 4 times, resulting in a remainder of 1.
The next digit of our result is 4. 
Result so far: 14.0
If we subtract 12 from 13, we get 1.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 3

Let's proceed to step 3:
3 can be fit into 11 3 times, resulting in a remainder of 2.
The next digit of our result is 3. 
Result so far: 143.0
Subtracting 9 from 11 leaves us with 2.
Bring next digit (8) of the dividend behind the 2 and repeat the process: 28 / 3

Let's proceed to step 4:
3 goes into 28 9 times with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 1439.0
Subtracting 27 from 28 leaves us with 1.
Fetch the next digit (7) from the dividend, attach it to 1 and continue: 17 / 3

On to step 5:
When dividing 17 by 3, we get 5 with a remainder of 2.
The number 5 becomes the next digit in our result. 
Result so far: 14395.0
The remainder is 2 after subtracting 15 from 17.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 3

On to step 6:
3 can be fit into 20 6 times, resulting in a remainder of 2.
The next digit of our result is 6. 
Result so far: 143956.0
Deduct 18 from 20 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
If we divide 20 by 3, we get 6 and a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 143956.6
Subtracting 18 from 20 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 8:
If we divide 20 by 3, we get 6 and a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 143956.66
Deduct 18 from 20 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Our division results in 143956.66 with a remaining 0.002.