12459544 divided by 807 
We want to divide 12459544 by 807.

Going ahead to step 1:
When dividing 1 by 807, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 807

On to step 2:
807 can be fit into 12 0 times, resulting in a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Fetch the next digit (4) from the dividend, attach it to 12 and continue: 124 / 807

Advancing to step 3:
When dividing 124 by 807, we get 0 with a remainder of 124.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 124 leaves us with 124.
Bring next digit (5) of the dividend behind the 124 and repeat the process: 1245 / 807

On to step 4:
If we divide 1245 by 807, we get 1 and a remainder of 438.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 807 from 1245 leaves us with 438.
Append the next digit (9) from the dividend to 438 and continue with: 4389 / 807

Moving on to step 5:
If we divide 4389 by 807, we get 5 and a remainder of 354.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
If we subtract 4035 from 4389, we get 354.
Grab the next digit (5) from the dividend, add it to 354, then carry on: 3545 / 807

On to step 6:
If we divide 3545 by 807, we get 4 and a remainder of 317.
Put 4 as the next digit of the answer. 
Result so far: 154.0
If we subtract 3228 from 3545, we get 317.
Fetch the next digit (4) from the dividend, attach it to 317 and continue: 3174 / 807

Going ahead to step 7:
The number 807 fits into 3174 3 times, leaving a remainder of 753.
Use 3 as the next digit of our solution. 
Result so far: 1543.0
The remainder is 753 after subtracting 2421 from 3174.
Take the next digit (4) from the dividend and append it to 753, then repeat: 7534 / 807

Step 8:
807 can be fit into 7534 9 times, resulting in a remainder of 271.
Use 9 as the next digit of our solution. 
Result so far: 15439.0
The remainder is 271 after subtracting 7263 from 7534.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2710, and continue the process.

On to step 9:
807 can be fit into 2710 3 times, resulting in a remainder of 289.
Put 3 as the next digit of the answer. 
Result so far: 15439.3
If we take 2421 away from 2710, we end up with 289.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2890, and continue the process.

Step 10:
2890 divided by 807 is 3 with a remainder of 469.
The number 3 becomes the next digit in our result. 
Result so far: 15439.33
Deduct 2421 from 2890 and we're left with 469.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4690, and continue the process.

After the division, we end up with 15439.33 and a remainder of 0.469.