We divide 399893 by 78
Our goal is to divide 399893 by 78.

Moving on to step 1:
If we divide 3 by 78, we get 0 and 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.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 78

Step 2:
39 divided by 78 is 0 with a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Bring next digit (9) of the dividend behind the 39 and repeat the process: 399 / 78

On to step 3:
78 goes into 399 5 times with a remainder of 9.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Subtract 390 from 399 to get 9.
Take the next digit (8) from the dividend and append it to 9, then repeat: 98 / 78

Step 4:
78 goes into 98 1 times with a remainder of 20.
The next digit of our result is 1. 
Result so far: 51.0
Deduct 78 from 98 and we're left with 20.
Append the next digit (9) from the dividend to 20 and continue with: 209 / 78

Step 5:
When dividing 209 by 78, we get 2 with a remainder of 53.
Write down 2 as next digit of the result. 
Result so far: 512.0
If we subtract 156 from 209, we get 53.
Include the next digit (3) from the dividend after 53, then repeat: 533 / 78

Step 6:
533 divided by 78 is 6 with a remainder of 65.
The number 6 becomes the next digit in our result. 
Result so far: 5126.0
The remainder is 65 after subtracting 468 from 533.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Let's proceed to step 7:
If we divide 650 by 78, we get 8 and a remainder of 26.
Put 8 as the next digit of the answer. 
Result so far: 5126.8
The remainder is 26 after subtracting 624 from 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 8:
The number 78 fits into 260 3 times, leaving a remainder of 26.
The number 3 becomes the next digit in our result. 
Result so far: 5126.83
Subtract 234 from 260 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 9:
78 goes into 260 3 times with a remainder of 26.
Write down 3 as next digit of the result. 
Result so far: 5126.833
If we take 234 away from 260, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

The quotient of the division is 5126.833, and the remainder is 0.0026.