We look at the division of 864651 by 12 
We want to figure out the number of times 864651 can be divided by 12.

Going ahead to step 1:
12 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 12

Going ahead to step 2:
86 divided by 12 is 7 with a remainder of 2.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we subtract 84 from 86, we get 2.
Fetch the next digit (4) from the dividend, attach it to 2 and continue: 24 / 12

Step 3:
The number 12 fits into 24 2 times, leaving a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 72.0
Deduct 24 from 24 and we're left with 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 12

Going ahead to step 4:
The number 12 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 720.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (5) from the dividend, attach it to 6 and continue: 65 / 12

On to step 5:
12 goes into 65 5 times with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 7205.0
Deduct 60 from 65 and we're left with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 12

On to step 6:
When dividing 51 by 12, we get 4 with a remainder of 3.
Write down 4 as next digit of the result. 
Result so far: 72054.0
If we take 48 away from 51, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
12 goes into 30 2 times with a remainder of 6.
Record the quotient 2 as the next digit in the result. 
Result so far: 72054.2
The remainder is 6 after subtracting 24 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 8:
12 goes into 60 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 72054.25
The remainder is 0 after subtracting 60 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
12 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 72054.25
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
If we divide 0 by 12, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 72054.25
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 72054.25 with a remaining 0.0.