Let's divide 39863 by 3
Let's see how many times 3 fits into 39863.

Moving on to step 1:
When dividing 3 by 3, we get 1 with a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 3 from 3 to get 0.
Fetch the next digit (9) from the dividend, attach it to 0 and continue: 9 / 3

On to step 2:
If we divide 9 by 3, we get 3 and a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 13.0
The remainder is 0 after subtracting 9 from 9.
Grab the next digit (8) from the dividend, add it to 0, then carry on: 8 / 3

On to step 3:
If we divide 8 by 3, we get 2 and a remainder of 2.
The next digit of our result is 2. 
Result so far: 132.0
The remainder is 2 after subtracting 6 from 8.
Append the next digit (6) from the dividend to 2 and continue with: 26 / 3

Advancing to step 4:
3 goes into 26 8 times with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 1328.0
The remainder is 2 after subtracting 24 from 26.
Include the next digit (3) from the dividend after 2, then repeat: 23 / 3

Moving on to step 5:
If we divide 23 by 3, we get 7 and a remainder of 2.
The next digit of our result is 7. 
Result so far: 13287.0
Deduct 21 from 23 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.

Advancing to step 6:
When dividing 20 by 3, we get 6 with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 13287.6
If we take 18 away from 20, we end up 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 7:
20 divided by 3 is 6 with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 13287.66
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.

The final result is 13287.66 with a remainder of 0.002.