Let's divide 666864 by 78
Our goal is to divide 666864 by 78.

Let's proceed to step 1:
78 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 78

Step 2:
78 goes into 66 0 times with a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Bring next digit (6) of the dividend behind the 66 and repeat the process: 666 / 78

Let's proceed to step 3:
666 divided by 78 is 8 with a remainder of 42.
The next digit of our result is 8. 
Result so far: 8.0
The remainder is 42 after subtracting 624 from 666.
Include the next digit (8) from the dividend after 42, then repeat: 428 / 78

Advancing to step 4:
When dividing 428 by 78, we get 5 with a remainder of 38.
Use 5 as the next digit of our solution. 
Result so far: 85.0
Deduct 390 from 428 and we're left with 38.
Grab the next digit (6) from the dividend, add it to 38, then carry on: 386 / 78

Going ahead to step 5:
78 can be fit into 386 4 times, resulting in a remainder of 74.
The number 4 becomes the next digit in our result. 
Result so far: 854.0
If we take 312 away from 386, we end up with 74.
Bring next digit (4) of the dividend behind the 74 and repeat the process: 744 / 78

On to step 6:
744 divided by 78 is 9 with a remainder of 42.
The number 9 becomes the next digit in our result. 
Result so far: 8549.0
If we take 702 away from 744, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 7:
If we divide 420 by 78, we get 5 and a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 8549.5
Deduct 390 from 420 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 8:
78 can be fit into 300 3 times, resulting in a remainder of 66.
The next digit of our result is 3. 
Result so far: 8549.53
Deduct 234 from 300 and we're left with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Step 9:
When dividing 660 by 78, we get 8 with a remainder of 36.
The next digit of our result is 8. 
Result so far: 8549.538
If we take 624 away from 660, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 10:
78 can be fit into 360 4 times, resulting in a remainder of 48.
The number 4 becomes the next digit in our result. 
Result so far: 8549.5384
Subtract 312 from 360 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 11:
78 goes into 480 6 times with a remainder of 12.
Write down 6 as next digit of the result. 
Result so far: 8549.53846
If we take 468 away from 480, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 12:
120 divided by 78 is 1 with a remainder of 42.
Use 1 as the next digit of our solution. 
Result so far: 8549.538461
Deduct 78 from 120 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 13:
When dividing 420 by 78, we get 5 with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 8549.5384615
Subtracting 390 from 420 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 14:
300 divided by 78 is 3 with a remainder of 66.
Record the quotient 3 as the next digit in the result. 
Result so far: 8549.53846153
Subtracting 234 from 300 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

The final result is 8549.53846153 with a remainder of 6.6e-08.