789643 divided by 78 
We want to figure out the number of times 789643 can be divided by 78.

On to step 1:
78 goes into 7 0 times with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 78

Going ahead to step 2:
78 can be fit into 78 1 times, resulting in a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 78 away from 78, we end up with 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 78

On to step 3:
78 can be fit into 9 0 times, resulting in a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 10.0
The remainder is 9 after subtracting 0 from 9.
Append the next digit (6) from the dividend to 9 and continue with: 96 / 78

Going ahead to step 4:
78 can be fit into 96 1 times, resulting in a remainder of 18.
Record the quotient 1 as the next digit in the result. 
Result so far: 101.0
If we take 78 away from 96, we end up with 18.
Include the next digit (4) from the dividend after 18, then repeat: 184 / 78

Step 5:
78 can be fit into 184 2 times, resulting in a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 1012.0
If we subtract 156 from 184, we get 28.
Grab the next digit (3) from the dividend, add it to 28, then carry on: 283 / 78

Let's proceed to step 6:
When dividing 283 by 78, we get 3 with a remainder of 49.
Put 3 as the next digit of the answer. 
Result so far: 10123.0
If we take 234 away from 283, we end up with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Step 7:
490 divided by 78 is 6 with a remainder of 22.
Write down 6 as next digit of the result. 
Result so far: 10123.6
If we take 468 away from 490, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 8:
220 divided by 78 is 2 with a remainder of 64.
The number 2 becomes the next digit in our result. 
Result so far: 10123.62
Subtracting 156 from 220 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Going ahead to step 9:
78 goes into 640 8 times with a remainder of 16.
The next digit of our result is 8. 
Result so far: 10123.628
Subtracting 624 from 640 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 10:
The number 78 fits into 160 2 times, leaving a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 10123.6282
Subtracting 156 from 160 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 11:
The number 78 fits into 40 0 times, leaving a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 10123.6282
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 12:
78 goes into 400 5 times with a remainder of 10.
The next digit of our result is 5. 
Result so far: 10123.628205
If we take 390 away from 400, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 13:
78 can be fit into 100 1 times, resulting in a remainder of 22.
The next digit of our result is 1. 
Result so far: 10123.6282051
Deduct 78 from 100 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 14:
78 goes into 220 2 times with a remainder of 64.
The next digit of our result is 2. 
Result so far: 10123.62820512
Deduct 156 from 220 and we're left with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

The final outcome is 10123.62820512, with a leftover of 6.4e-08.