We're dividing 813851 by 3 
Our goal is to divide 813851 by 3.

Advancing to step 1:
3 goes into 8 2 times with a remainder of 2.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 6 from 8, we get 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 3

Going ahead to step 2:
When dividing 21 by 3, we get 7 with a remainder of 0.
Record the quotient 7 as the next digit in the result. 
Result so far: 27.0
If we take 21 away from 21, we end up with 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 3

On to step 3:
3 divided by 3 is 1 with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 271.0
Deduct 3 from 3 and we're left with 0.
Grab the next digit (8) from the dividend, add it to 0, then carry on: 8 / 3

Going ahead to step 4:
8 divided by 3 is 2 with a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 2712.0
The remainder is 2 after subtracting 6 from 8.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 3

Advancing to step 5:
The number 3 fits into 25 8 times, leaving a remainder of 1.
The next digit of our result is 8. 
Result so far: 27128.0
Deduct 24 from 25 and we're left with 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 3

On to step 6:
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: 271283.0
Deduct 9 from 11 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:
20 divided by 3 is 6 with a remainder of 2.
Write down 6 as next digit of the result. 
Result so far: 271283.6
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.

On to step 8:
3 goes into 20 6 times with a remainder of 2.
Write down 6 as next digit of the result. 
Result so far: 271283.66
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.

The final result is 271283.66 with a remainder of 0.002.