Let's divide 78821023 by 646
We want to divide 78821023 by 646.

Moving on to step 1:
When dividing 7 by 646, we get 0 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 / 646

Going ahead to step 2:
78 divided by 646 is 0 with a remainder of 78.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 78, we end up with 78.
Take the next digit (8) from the dividend and append it to 78, then repeat: 788 / 646

Moving on to step 3:
The number 646 fits into 788 1 times, leaving a remainder of 142.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 646 from 788 to get 142.
Include the next digit (2) from the dividend after 142, then repeat: 1422 / 646

Going ahead to step 4:
The number 646 fits into 1422 2 times, leaving a remainder of 130.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 1292 from 1422 and we're left with 130.
Fetch the next digit (1) from the dividend, attach it to 130 and continue: 1301 / 646

Going ahead to step 5:
646 can be fit into 1301 2 times, resulting in a remainder of 9.
The next digit of our result is 2. 
Result so far: 122.0
Subtracting 1292 from 1301 leaves us with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 646

Going ahead to step 6:
The number 646 fits into 90 0 times, leaving a remainder of 90.
The next digit of our result is 0. 
Result so far: 1220.0
The remainder is 90 after subtracting 0 from 90.
Include the next digit (2) from the dividend after 90, then repeat: 902 / 646

Moving on to step 7:
646 can be fit into 902 1 times, resulting in a remainder of 256.
Put 1 as the next digit of the answer. 
Result so far: 12201.0
If we take 646 away from 902, we end up with 256.
Bring next digit (3) of the dividend behind the 256 and repeat the process: 2563 / 646

Let's proceed to step 8:
The number 646 fits into 2563 3 times, leaving a remainder of 625.
Put 3 as the next digit of the answer. 
Result so far: 122013.0
If we take 1938 away from 2563, we end up with 625.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6250, and continue the process.

Let's proceed to step 9:
When dividing 6250 by 646, we get 9 with a remainder of 436.
Record the quotient 9 as the next digit in the result. 
Result so far: 122013.9
If we take 5814 away from 6250, we end up with 436.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

On to step 10:
If we divide 4360 by 646, we get 6 and a remainder of 484.
Use 6 as the next digit of our solution. 
Result so far: 122013.96
Deduct 3876 from 4360 and we're left with 484.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4840, and continue the process.

Let's proceed to step 11:
646 goes into 4840 7 times with a remainder of 318.
Record the quotient 7 as the next digit in the result. 
Result so far: 122013.967
The remainder is 318 after subtracting 4522 from 4840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3180, and continue the process.

On to step 12:
The number 646 fits into 3180 4 times, leaving a remainder of 596.
Write down 4 as next digit of the result. 
Result so far: 122013.9674
If we take 2584 away from 3180, we end up with 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Step 13:
The number 646 fits into 5960 9 times, leaving a remainder of 146.
The number 9 becomes the next digit in our result. 
Result so far: 122013.96749
Subtract 5814 from 5960 to get 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Advancing to step 14:
646 goes into 1460 2 times with a remainder of 168.
Use 2 as the next digit of our solution. 
Result so far: 122013.967492
The remainder is 168 after subtracting 1292 from 1460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

On to step 15:
646 can be fit into 1680 2 times, resulting in a remainder of 388.
The number 2 becomes the next digit in our result. 
Result so far: 122013.9674922
Subtract 1292 from 1680 to get 388.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

The final result is 122013.9674922 with a remainder of 3.88e-06.