78309845 divided by 255 
We want to figure out the number of times 78309845 can be divided by 255.

On to step 1:
7 divided by 255 is 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 255

On to step 2:
255 can be fit into 78 0 times, resulting in a remainder of 78.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 78 after subtracting 0 from 78.
Bring next digit (3) of the dividend behind the 78 and repeat the process: 783 / 255

On to step 3:
255 goes into 783 3 times with a remainder of 18.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 18 after subtracting 765 from 783.
Fetch the next digit (0) from the dividend, attach it to 18 and continue: 180 / 255

Going ahead to step 4:
255 can be fit into 180 0 times, resulting in a remainder of 180.
The next digit of our result is 0. 
Result so far: 30.0
The remainder is 180 after subtracting 0 from 180.
Include the next digit (9) from the dividend after 180, then repeat: 1809 / 255

Let's proceed to step 5:
The number 255 fits into 1809 7 times, leaving a remainder of 24.
Put 7 as the next digit of the answer. 
Result so far: 307.0
If we subtract 1785 from 1809, we get 24.
Grab the next digit (8) from the dividend, add it to 24, then carry on: 248 / 255

Advancing to step 6:
The number 255 fits into 248 0 times, leaving a remainder of 248.
The number 0 becomes the next digit in our result. 
Result so far: 3070.0
If we take 0 away from 248, we end up with 248.
Append the next digit (4) from the dividend to 248 and continue with: 2484 / 255

Advancing to step 7:
255 can be fit into 2484 9 times, resulting in a remainder of 189.
Use 9 as the next digit of our solution. 
Result so far: 30709.0
If we take 2295 away from 2484, we end up with 189.
Append the next digit (5) from the dividend to 189 and continue with: 1895 / 255

Moving on to step 8:
If we divide 1895 by 255, we get 7 and a remainder of 110.
The next digit of our result is 7. 
Result so far: 307097.0
The remainder is 110 after subtracting 1785 from 1895.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Moving on to step 9:
1100 divided by 255 is 4 with a remainder of 80.
The next digit of our result is 4. 
Result so far: 307097.4
Subtracting 1020 from 1100 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 10:
If we divide 800 by 255, we get 3 and a remainder of 35.
Write down 3 as next digit of the result. 
Result so far: 307097.43
If we take 765 away from 800, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 11:
350 divided by 255 is 1 with a remainder of 95.
Put 1 as the next digit of the answer. 
Result so far: 307097.431
Deduct 255 from 350 and we're left with 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

On to step 12:
If we divide 950 by 255, we get 3 and a remainder of 185.
Use 3 as the next digit of our solution. 
Result so far: 307097.4313
Subtracting 765 from 950 leaves us with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Going ahead to step 13:
If we divide 1850 by 255, we get 7 and a remainder of 65.
The number 7 becomes the next digit in our result. 
Result so far: 307097.43137
If we take 1785 away from 1850, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 14:
255 goes into 650 2 times with a remainder of 140.
Record the quotient 2 as the next digit in the result. 
Result so far: 307097.431372
Deduct 510 from 650 and we're left with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 15:
255 can be fit into 1400 5 times, resulting in a remainder of 125.
Put 5 as the next digit of the answer. 
Result so far: 307097.4313725
Subtracting 1275 from 1400 leaves us with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Advancing to step 16:
1250 divided by 255 is 4 with a remainder of 230.
The next digit of our result is 4. 
Result so far: 307097.43137254
The remainder is 230 after subtracting 1020 from 1250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

The final outcome is 307097.43137254, with a leftover of 2.3e-07.