866454 divided by 15 
We want to figure out the number of times 866454 can be divided by 15.

Going ahead to step 1:
The number 15 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 15

Moving on to step 2:
15 goes into 86 5 times with a remainder of 11.
Use 5 as the next digit of our solution. 
Result so far: 5.0
The remainder is 11 after subtracting 75 from 86.
Take the next digit (6) from the dividend and append it to 11, then repeat: 116 / 15

Moving on to step 3:
The number 15 fits into 116 7 times, leaving a remainder of 11.
The number 7 becomes the next digit in our result. 
Result so far: 57.0
If we subtract 105 from 116, we get 11.
Bring next digit (4) of the dividend behind the 11 and repeat the process: 114 / 15

On to step 4:
When dividing 114 by 15, we get 7 with a remainder of 9.
Write down 7 as next digit of the result. 
Result so far: 577.0
The remainder is 9 after subtracting 105 from 114.
Bring next digit (5) of the dividend behind the 9 and repeat the process: 95 / 15

Let's proceed to step 5:
When dividing 95 by 15, we get 6 with a remainder of 5.
Write down 6 as next digit of the result. 
Result so far: 5776.0
Subtracting 90 from 95 leaves us with 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 15

Going ahead to step 6:
15 can be fit into 54 3 times, resulting in a remainder of 9.
Record the quotient 3 as the next digit in the result. 
Result so far: 57763.0
Subtract 45 from 54 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 7:
90 divided by 15 is 6 with a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 57763.6
Subtracting 90 from 90 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.

Step 8:
When dividing 0 by 15, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 57763.6
If we take 0 away from 0, we end up 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:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 57763.6
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 quotient of the division is 57763.6, and the remainder is 0.0.