Let's divide 390255 by 78
Let's see how many times 78 fits into 390255.

Advancing to step 1:
The number 78 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 78

Advancing to step 2:
78 can be fit into 39 0 times, resulting in a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Append the next digit (0) from the dividend to 39 and continue with: 390 / 78

Advancing to step 3:
When dividing 390 by 78, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 5.0
Deduct 390 from 390 and we're left with 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 78

Moving on to step 4:
If we divide 2 by 78, we get 0 and a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 50.0
The remainder is 2 after subtracting 0 from 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 78

On to step 5:
78 goes into 25 0 times with a remainder of 25.
Write down 0 as next digit of the result. 
Result so far: 500.0
The remainder is 25 after subtracting 0 from 25.
Take the next digit (5) from the dividend and append it to 25, then repeat: 255 / 78

Going ahead to step 6:
255 divided by 78 is 3 with a remainder of 21.
The next digit of our result is 3. 
Result so far: 5003.0
If we subtract 234 from 255, we get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 7:
78 can be fit into 210 2 times, resulting in a remainder of 54.
The next digit of our result is 2. 
Result so far: 5003.2
If we take 156 away from 210, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 8:
When dividing 540 by 78, we get 6 with a remainder of 72.
Record the quotient 6 as the next digit in the result. 
Result so far: 5003.26
If we subtract 468 from 540, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 9:
78 can be fit into 720 9 times, resulting in a remainder of 18.
Put 9 as the next digit of the answer. 
Result so far: 5003.269
If we subtract 702 from 720, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 10:
When dividing 180 by 78, we get 2 with a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 5003.2692
Deduct 156 from 180 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 11:
78 goes into 240 3 times with a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 5003.26923
Deduct 234 from 240 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 12:
78 can be fit into 60 0 times, resulting in a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 5003.26923
If we take 0 away from 60, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 13:
78 goes into 600 7 times with a remainder of 54.
Put 7 as the next digit of the answer. 
Result so far: 5003.2692307
Subtracting 546 from 600 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Let's proceed to step 14:
When dividing 540 by 78, we get 6 with a remainder of 72.
Record the quotient 6 as the next digit in the result. 
Result so far: 5003.26923076
If we take 468 away from 540, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

The final result is 5003.26923076 with a remainder of 7.2e-08.