We look at the division of 861511 by 3 
We want to figure out the number of times 861511 can be divided by 3.

Going ahead to step 1:
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: 2.0
If we take 6 away from 8, we end up with 2.
Bring next digit (6) of the dividend behind the 2 and repeat the process: 26 / 3

Let's proceed to step 2:
When dividing 26 by 3, we get 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 28.0
Subtract 24 from 26 to get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 3

Moving on to step 3:
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: 287.0
Deduct 21 from 21 and we're left with 0.
Include the next digit (5) from the dividend after 0, then repeat: 5 / 3

On to step 4:
3 goes into 5 1 times with a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 2871.0
The remainder is 2 after subtracting 3 from 5.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 3

Let's proceed to step 5:
21 divided by 3 is 7 with a remainder of 0.
The next digit of our result is 7. 
Result so far: 28717.0
Deduct 21 from 21 and we're left with 0.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 3

Advancing to step 6:
When dividing 1 by 3, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 287170.0
Subtract 0 from 1 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:
10 divided by 3 is 3 with a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 287170.3
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.

Step 8:
The number 3 fits into 10 3 times, leaving a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 287170.33
Deduct 9 from 10 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.

The quotient of the division is 287170.33, and the remainder is 0.001.