803899 ÷ 3 
We're looking to find how many times 3 goes into 803899.

Going ahead to step 1:
8 divided by 3 is 2 with a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 6 from 8 and we're left with 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 3

Moving on to step 2:
3 goes into 20 6 times with a remainder of 2.
The next digit of our result is 6. 
Result so far: 26.0
Subtract 18 from 20 to get 2.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 3

Let's proceed to step 3:
3 goes into 23 7 times with a remainder of 2.
The number 7 becomes the next digit in our result. 
Result so far: 267.0
Subtract 21 from 23 to get 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 3

Step 4:
If we divide 28 by 3, we get 9 and a remainder of 1.
The next digit of our result is 9. 
Result so far: 2679.0
Deduct 27 from 28 and we're left with 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 3

Going ahead to step 5:
19 divided by 3 is 6 with a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 26796.0
The remainder is 1 after subtracting 18 from 19.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 3

Advancing to step 6:
3 goes into 19 6 times with a remainder of 1.
Put 6 as the next digit of the answer. 
Result so far: 267966.0
Subtract 18 from 19 to get 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 7:
When dividing 10 by 3, we get 3 with a remainder of 1.
The next digit of our result is 3. 
Result so far: 267966.3
If we subtract 9 from 10, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 8:
When dividing 10 by 3, we get 3 with a remainder of 1.
The next digit of our result is 3. 
Result so far: 267966.33
If we subtract 9 from 10, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

In conclusion, the division gives 267966.33 with a balance of 0.001.