642934 ÷ 78 
Our goal is to divide 642934 by 78.

Step 1:
When dividing 6 by 78, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 78

Advancing to step 2:
The number 78 fits into 64 0 times, leaving a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Append the next digit (2) from the dividend to 64 and continue with: 642 / 78

Moving on to step 3:
When dividing 642 by 78, we get 8 with a remainder of 18.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 624 away from 642, we end up with 18.
Take the next digit (9) from the dividend and append it to 18, then repeat: 189 / 78

Let's proceed to step 4:
The number 78 fits into 189 2 times, leaving a remainder of 33.
Use 2 as the next digit of our solution. 
Result so far: 82.0
Subtracting 156 from 189 leaves us with 33.
Include the next digit (3) from the dividend after 33, then repeat: 333 / 78

Advancing to step 5:
333 divided by 78 is 4 with a remainder of 21.
Write down 4 as next digit of the result. 
Result so far: 824.0
Subtracting 312 from 333 leaves us with 21.
Take the next digit (4) from the dividend and append it to 21, then repeat: 214 / 78

Going ahead to step 6:
214 divided by 78 is 2 with a remainder of 58.
The next digit of our result is 2. 
Result so far: 8242.0
Subtracting 156 from 214 leaves us with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 7:
78 goes into 580 7 times with a remainder of 34.
Write down 7 as next digit of the result. 
Result so far: 8242.7
Subtract 546 from 580 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 8:
78 goes into 340 4 times with a remainder of 28.
The number 4 becomes the next digit in our result. 
Result so far: 8242.74
Subtracting 312 from 340 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 9:
78 goes into 280 3 times with a remainder of 46.
Record the quotient 3 as the next digit in the result. 
Result so far: 8242.743
If we take 234 away from 280, we end up with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 10:
78 goes into 460 5 times with a remainder of 70.
Write down 5 as next digit of the result. 
Result so far: 8242.7435
The remainder is 70 after subtracting 390 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 11:
78 can be fit into 700 8 times, resulting in a remainder of 76.
Write down 8 as next digit of the result. 
Result so far: 8242.74358
Subtract 624 from 700 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Step 12:
When dividing 760 by 78, we get 9 with a remainder of 58.
Use 9 as the next digit of our solution. 
Result so far: 8242.743589
If we subtract 702 from 760, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Step 13:
580 divided by 78 is 7 with a remainder of 34.
Use 7 as the next digit of our solution. 
Result so far: 8242.7435897
If we subtract 546 from 580, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 14:
340 divided by 78 is 4 with a remainder of 28.
Put 4 as the next digit of the answer. 
Result so far: 8242.74358974
The remainder is 28 after subtracting 312 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

The final outcome is 8242.74358974, with a leftover of 2.8e-08.