542643 ÷ 78 
Let's see how many times 78 fits into 542643.

Step 1:
5 divided by 78 is 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Bring next digit (4) of the dividend behind the 5 and repeat the process: 54 / 78

Let's proceed to step 2:
The number 78 fits into 54 0 times, leaving a remainder of 54.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 54, we get 54.
Include the next digit (2) from the dividend after 54, then repeat: 542 / 78

Going ahead to step 3:
The number 78 fits into 542 6 times, leaving a remainder of 74.
Put 6 as the next digit of the answer. 
Result so far: 6.0
The remainder is 74 after subtracting 468 from 542.
Include the next digit (6) from the dividend after 74, then repeat: 746 / 78

Let's proceed to step 4:
The number 78 fits into 746 9 times, leaving a remainder of 44.
Write down 9 as next digit of the result. 
Result so far: 69.0
If we take 702 away from 746, we end up with 44.
Grab the next digit (4) from the dividend, add it to 44, then carry on: 444 / 78

Let's proceed to step 5:
78 goes into 444 5 times with a remainder of 54.
Put 5 as the next digit of the answer. 
Result so far: 695.0
If we subtract 390 from 444, we get 54.
Include the next digit (3) from the dividend after 54, then repeat: 543 / 78

Let's proceed to step 6:
When dividing 543 by 78, we get 6 with a remainder of 75.
Put 6 as the next digit of the answer. 
Result so far: 6956.0
Deduct 468 from 543 and we're left with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Going ahead to step 7:
78 goes into 750 9 times with a remainder of 48.
Write down 9 as next digit of the result. 
Result so far: 6956.9
Subtract 702 from 750 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.

Step 8:
When dividing 480 by 78, we get 6 with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 6956.96
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.

Let's proceed to step 9:
78 goes into 120 1 times with a remainder of 42.
Record the quotient 1 as the next digit in the result. 
Result so far: 6956.961
The remainder is 42 after subtracting 78 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 10:
78 goes into 420 5 times with a remainder of 30.
Put 5 as the next digit of the answer. 
Result so far: 6956.9615
The remainder is 30 after subtracting 390 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 11:
The number 78 fits into 300 3 times, leaving a remainder of 66.
Record the quotient 3 as the next digit in the result. 
Result so far: 6956.96153
If we take 234 away from 300, we end up 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.

Moving on to step 12:
660 divided by 78 is 8 with a remainder of 36.
Use 8 as the next digit of our solution. 
Result so far: 6956.961538
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.

Going ahead to step 13:
The number 78 fits into 360 4 times, leaving a remainder of 48.
Put 4 as the next digit of the answer. 
Result so far: 6956.9615384
If we take 312 away from 360, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 14:
If we divide 480 by 78, we get 6 and a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 6956.96153846
The remainder is 12 after subtracting 468 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final outcome is 6956.96153846, with a leftover of 1.2e-08.