391940 ÷ 78 
We want to figure out the number of times 391940 can be divided by 78.

Step 1:
78 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 78

Going ahead to step 2:
When dividing 39 by 78, we get 0 with a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Take the next digit (1) from the dividend and append it to 39, then repeat: 391 / 78

Going ahead to step 3:
The number 78 fits into 391 5 times, leaving a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 5.0
Deduct 390 from 391 and we're left with 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 78

Advancing to step 4:
The number 78 fits into 19 0 times, leaving a remainder of 19.
Write down 0 as next digit of the result. 
Result so far: 50.0
Subtract 0 from 19 to get 19.
Include the next digit (4) from the dividend after 19, then repeat: 194 / 78

Advancing to step 5:
If we divide 194 by 78, we get 2 and a remainder of 38.
Record the quotient 2 as the next digit in the result. 
Result so far: 502.0
Deduct 156 from 194 and we're left with 38.
Include the next digit (0) from the dividend after 38, then repeat: 380 / 78

Moving on to step 6:
78 goes into 380 4 times with a remainder of 68.
Use 4 as the next digit of our solution. 
Result so far: 5024.0
If we subtract 312 from 380, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Moving on to step 7:
78 goes into 680 8 times with a remainder of 56.
The next digit of our result is 8. 
Result so far: 5024.8
Subtracting 624 from 680 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 8:
560 divided by 78 is 7 with a remainder of 14.
Use 7 as the next digit of our solution. 
Result so far: 5024.87
If we take 546 away from 560, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 9:
When dividing 140 by 78, we get 1 with a remainder of 62.
Write down 1 as next digit of the result. 
Result so far: 5024.871
If we subtract 78 from 140, we get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Let's proceed to step 10:
When dividing 620 by 78, we get 7 with a remainder of 74.
The next digit of our result is 7. 
Result so far: 5024.8717
Subtracting 546 from 620 leaves us with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Advancing to step 11:
78 can be fit into 740 9 times, resulting in a remainder of 38.
The number 9 becomes the next digit in our result. 
Result so far: 5024.87179
If we take 702 away from 740, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 12:
78 goes into 380 4 times with a remainder of 68.
The number 4 becomes the next digit in our result. 
Result so far: 5024.871794
Deduct 312 from 380 and we're left with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

On to step 13:
When dividing 680 by 78, we get 8 with a remainder of 56.
Record the quotient 8 as the next digit in the result. 
Result so far: 5024.8717948
Subtract 624 from 680 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 14:
78 goes into 560 7 times with a remainder of 14.
Put 7 as the next digit of the answer. 
Result so far: 5024.87179487
If we take 546 away from 560, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Our division results in 5024.87179487 with a remaining 1.4e-08.