646866 ÷ 10 
Our goal is to divide 646866 by 10.

Advancing to step 1:
If we divide 6 by 10, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 10

Let's proceed to step 2:
The number 10 fits into 64 6 times, leaving a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Subtracting 60 from 64 leaves us with 4.
Append the next digit (6) from the dividend to 4 and continue with: 46 / 10

Moving on to step 3:
46 divided by 10 is 4 with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 64.0
The remainder is 6 after subtracting 40 from 46.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 10

Going ahead to step 4:
10 can be fit into 68 6 times, resulting in a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 646.0
If we take 60 away from 68, we end up with 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 10

Step 5:
When dividing 86 by 10, we get 8 with a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 6468.0
Subtracting 80 from 86 leaves us with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 10

Let's proceed to step 6:
If we divide 66 by 10, we get 6 and a remainder of 6.
Record the quotient 6 as the next digit in the result. 
Result so far: 64686.0
Subtract 60 from 66 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 7:
10 can be fit into 60 6 times, resulting in a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 64686.6
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.

Moving on to step 8:
The number 10 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 64686.6
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
0 divided by 10 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 64686.6
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.

The final result is 64686.6 with a remainder of 0.0.