Let's divide 12639333 by 810
Our goal is to divide 12639333 by 810.

Advancing to step 1:
1 divided by 810 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 810

Let's proceed to step 2:
12 divided by 810 is 0 with a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Fetch the next digit (6) from the dividend, attach it to 12 and continue: 126 / 810

Moving on to step 3:
If we divide 126 by 810, we get 0 and a remainder of 126.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 126, we get 126.
Bring next digit (3) of the dividend behind the 126 and repeat the process: 1263 / 810

Step 4:
If we divide 1263 by 810, we get 1 and a remainder of 453.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 810 from 1263 and we're left with 453.
Bring next digit (9) of the dividend behind the 453 and repeat the process: 4539 / 810

On to step 5:
810 can be fit into 4539 5 times, resulting in a remainder of 489.
Put 5 as the next digit of the answer. 
Result so far: 15.0
The remainder is 489 after subtracting 4050 from 4539.
Bring next digit (3) of the dividend behind the 489 and repeat the process: 4893 / 810

Moving on to step 6:
When dividing 4893 by 810, we get 6 with a remainder of 33.
Put 6 as the next digit of the answer. 
Result so far: 156.0
If we subtract 4860 from 4893, we get 33.
Grab the next digit (3) from the dividend, add it to 33, then carry on: 333 / 810

Step 7:
810 goes into 333 0 times with a remainder of 333.
Put 0 as the next digit of the answer. 
Result so far: 1560.0
If we subtract 0 from 333, we get 333.
Include the next digit (3) from the dividend after 333, then repeat: 3333 / 810

Moving on to step 8:
810 can be fit into 3333 4 times, resulting in a remainder of 93.
Put 4 as the next digit of the answer. 
Result so far: 15604.0
Subtracting 3240 from 3333 leaves us with 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Going ahead to step 9:
930 divided by 810 is 1 with a remainder of 120.
Put 1 as the next digit of the answer. 
Result so far: 15604.1
Deduct 810 from 930 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Moving on to step 10:
1200 divided by 810 is 1 with a remainder of 390.
The number 1 becomes the next digit in our result. 
Result so far: 15604.11
If we take 810 away from 1200, we end up with 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

Our division results in 15604.11 with a remaining 0.39.