We look at the division of 851518 by 3 
We want to divide 851518 by 3.

On to step 1:
The number 3 fits into 8 2 times, leaving a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 6 from 8 to get 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 3

Step 2:
25 divided by 3 is 8 with a remainder of 1.
The next digit of our result is 8. 
Result so far: 28.0
If we subtract 24 from 25, we get 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 3

Advancing to step 3:
3 can be fit into 11 3 times, resulting in a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 283.0
If we subtract 9 from 11, we get 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 3

Advancing to step 4:
When dividing 25 by 3, we get 8 with a remainder of 1.
The number 8 becomes the next digit in our result. 
Result so far: 2838.0
The remainder is 1 after subtracting 24 from 25.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 3

Moving on to step 5:
If we divide 11 by 3, we get 3 and a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 28383.0
Subtracting 9 from 11 leaves us with 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 3

Let's proceed to step 6:
3 goes into 28 9 times with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 283839.0
Deduct 27 from 28 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.

On to step 7:
3 can be fit into 10 3 times, resulting in a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 283839.3
Subtract 9 from 10 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.

On to step 8:
3 goes into 10 3 times with a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 283839.33
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.

After the division, we end up with 283839.33 and a remainder of 0.001.