811209 divided by 78 
We want to divide 811209 by 78.

Step 1:
78 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 78

Let's proceed to step 2:
81 divided by 78 is 1 with a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 78 from 81, we get 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 78

Advancing to step 3:
The number 78 fits into 31 0 times, leaving a remainder of 31.
Put 0 as the next digit of the answer. 
Result so far: 10.0
If we subtract 0 from 31, we get 31.
Bring next digit (2) of the dividend behind the 31 and repeat the process: 312 / 78

On to step 4:
When dividing 312 by 78, we get 4 with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 104.0
The remainder is 0 after subtracting 312 from 312.
Append the next digit (0) from the dividend to 0 and continue with: 0 / 78

Let's proceed to step 5:
The number 78 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1040.0
If we subtract 0 from 0, we get 0.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 78

On to step 6:
When dividing 9 by 78, we get 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 10400.0
If we subtract 0 from 9, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 7:
The number 78 fits into 90 1 times, leaving a remainder of 12.
Put 1 as the next digit of the answer. 
Result so far: 10400.1
If we take 78 away from 90, 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.

On to step 8:
If we divide 120 by 78, we get 1 and a remainder of 42.
Write down 1 as next digit of the result. 
Result so far: 10400.11
Subtract 78 from 120 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Our division results in 10400.11 with a remaining 0.042.