78642579 ÷ 84 
We want to divide 78642579 by 84.

On to step 1:
84 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 84

Moving on to step 2:
When dividing 78 by 84, we get 0 with a remainder of 78.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 78 to get 78.
Bring next digit (6) of the dividend behind the 78 and repeat the process: 786 / 84

Advancing to step 3:
The number 84 fits into 786 9 times, leaving a remainder of 30.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
If we subtract 756 from 786, we get 30.
Include the next digit (4) from the dividend after 30, then repeat: 304 / 84

Let's proceed to step 4:
If we divide 304 by 84, we get 3 and a remainder of 52.
Put 3 as the next digit of the answer. 
Result so far: 93.0
If we subtract 252 from 304, we get 52.
Bring next digit (2) of the dividend behind the 52 and repeat the process: 522 / 84

Moving on to step 5:
522 divided by 84 is 6 with a remainder of 18.
Put 6 as the next digit of the answer. 
Result so far: 936.0
The remainder is 18 after subtracting 504 from 522.
Take the next digit (5) from the dividend and append it to 18, then repeat: 185 / 84

Going ahead to step 6:
84 goes into 185 2 times with a remainder of 17.
The number 2 becomes the next digit in our result. 
Result so far: 9362.0
Subtracting 168 from 185 leaves us with 17.
Include the next digit (7) from the dividend after 17, then repeat: 177 / 84

On to step 7:
177 divided by 84 is 2 with a remainder of 9.
Record the quotient 2 as the next digit in the result. 
Result so far: 93622.0
If we subtract 168 from 177, we get 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 84

Let's proceed to step 8:
84 can be fit into 99 1 times, resulting in a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 936221.0
If we subtract 84 from 99, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 9:
84 goes into 150 1 times with a remainder of 66.
Record the quotient 1 as the next digit in the result. 
Result so far: 936221.1
Subtracting 84 from 150 leaves us 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 10:
660 divided by 84 is 7 with a remainder of 72.
Write down 7 as next digit of the result. 
Result so far: 936221.17
The remainder is 72 after subtracting 588 from 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Step 11:
84 goes into 720 8 times with a remainder of 48.
The next digit of our result is 8. 
Result so far: 936221.178
If we subtract 672 from 720, we 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.

Going ahead to step 12:
If we divide 480 by 84, we get 5 and a remainder of 60.
The number 5 becomes the next digit in our result. 
Result so far: 936221.1785
If we subtract 420 from 480, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 13:
84 can be fit into 600 7 times, resulting in a remainder of 12.
The number 7 becomes the next digit in our result. 
Result so far: 936221.17857
Deduct 588 from 600 and we're left 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.

Step 14:
84 goes into 120 1 times with a remainder of 36.
Use 1 as the next digit of our solution. 
Result so far: 936221.178571
If we subtract 84 from 120, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 15:
360 divided by 84 is 4 with a remainder of 24.
Put 4 as the next digit of the answer. 
Result so far: 936221.1785714
The remainder is 24 after subtracting 336 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 16:
84 goes into 240 2 times with a remainder of 72.
The next digit of our result is 2. 
Result so far: 936221.17857142
Subtracting 168 from 240 leaves us 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 936221.17857142 with a remainder of 7.2e-08.