78215747 divided by 855 
We want to divide 78215747 by 855.

On to step 1:
If we divide 7 by 855, we get 0 and a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 855

On to step 2:
78 divided by 855 is 0 with a remainder of 78.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Grab the next digit (2) from the dividend, add it to 78, then carry on: 782 / 855

Advancing to step 3:
855 goes into 782 0 times with a remainder of 782.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 782 and we're left with 782.
Take the next digit (1) from the dividend and append it to 782, then repeat: 7821 / 855

Advancing to step 4:
855 can be fit into 7821 9 times, resulting in a remainder of 126.
Put 9 as the next digit of the answer. 
Result so far: 9.0
If we take 7695 away from 7821, we end up with 126.
Fetch the next digit (5) from the dividend, attach it to 126 and continue: 1265 / 855

Moving on to step 5:
855 can be fit into 1265 1 times, resulting in a remainder of 410.
The next digit of our result is 1. 
Result so far: 91.0
The remainder is 410 after subtracting 855 from 1265.
Bring next digit (7) of the dividend behind the 410 and repeat the process: 4107 / 855

Advancing to step 6:
The number 855 fits into 4107 4 times, leaving a remainder of 687.
Put 4 as the next digit of the answer. 
Result so far: 914.0
The remainder is 687 after subtracting 3420 from 4107.
Append the next digit (4) from the dividend to 687 and continue with: 6874 / 855

Let's proceed to step 7:
If we divide 6874 by 855, we get 8 and a remainder of 34.
Put 8 as the next digit of the answer. 
Result so far: 9148.0
Subtracting 6840 from 6874 leaves us with 34.
Bring next digit (7) of the dividend behind the 34 and repeat the process: 347 / 855

Moving on to step 8:
855 can be fit into 347 0 times, resulting in a remainder of 347.
The next digit of our result is 0. 
Result so far: 91480.0
If we subtract 0 from 347, we get 347.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3470, and continue the process.

On to step 9:
If we divide 3470 by 855, we get 4 and a remainder of 50.
The next digit of our result is 4. 
Result so far: 91480.4
Subtracting 3420 from 3470 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 10:
If we divide 500 by 855, we get 0 and a remainder of 500.
The next digit of our result is 0. 
Result so far: 91480.4
If we take 0 away from 500, we end up with 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Advancing to step 11:
5000 divided by 855 is 5 with a remainder of 725.
Use 5 as the next digit of our solution. 
Result so far: 91480.405
Subtract 4275 from 5000 to get 725.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7250, and continue the process.

Step 12:
The number 855 fits into 7250 8 times, leaving a remainder of 410.
Use 8 as the next digit of our solution. 
Result so far: 91480.4058
If we subtract 6840 from 7250, we get 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

Advancing to step 13:
855 can be fit into 4100 4 times, resulting in a remainder of 680.
Record the quotient 4 as the next digit in the result. 
Result so far: 91480.40584
The remainder is 680 after subtracting 3420 from 4100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Let's proceed to step 14:
855 can be fit into 6800 7 times, resulting in a remainder of 815.
Put 7 as the next digit of the answer. 
Result so far: 91480.405847
Deduct 5985 from 6800 and we're left with 815.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8150, and continue the process.

Step 15:
When dividing 8150 by 855, we get 9 with a remainder of 455.
The next digit of our result is 9. 
Result so far: 91480.4058479
If we take 7695 away from 8150, we end up with 455.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4550, and continue the process.

Step 16:
855 goes into 4550 5 times with a remainder of 275.
The next digit of our result is 5. 
Result so far: 91480.40584795
Subtracting 4275 from 4550 leaves us with 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

After the division, we end up with 91480.40584795 and a remainder of 2.75e-07.