12645811 ÷ 672 
We want to figure out the number of times 12645811 can be divided by 672.

Step 1:
672 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 672

Moving on to step 2:
When dividing 12 by 672, we get 0 with a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Append the next digit (6) from the dividend to 12 and continue with: 126 / 672

Advancing to step 3:
126 divided by 672 is 0 with a remainder of 126.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 126 after subtracting 0 from 126.
Take the next digit (4) from the dividend and append it to 126, then repeat: 1264 / 672

Step 4:
When dividing 1264 by 672, we get 1 with a remainder of 592.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 592 after subtracting 672 from 1264.
Take the next digit (5) from the dividend and append it to 592, then repeat: 5925 / 672

Step 5:
If we divide 5925 by 672, we get 8 and a remainder of 549.
Put 8 as the next digit of the answer. 
Result so far: 18.0
If we take 5376 away from 5925, we end up with 549.
Append the next digit (8) from the dividend to 549 and continue with: 5498 / 672

Advancing to step 6:
672 can be fit into 5498 8 times, resulting in a remainder of 122.
Use 8 as the next digit of our solution. 
Result so far: 188.0
If we take 5376 away from 5498, we end up with 122.
Take the next digit (1) from the dividend and append it to 122, then repeat: 1221 / 672

Moving on to step 7:
If we divide 1221 by 672, we get 1 and a remainder of 549.
The number 1 becomes the next digit in our result. 
Result so far: 1881.0
Deduct 672 from 1221 and we're left with 549.
Include the next digit (1) from the dividend after 549, then repeat: 5491 / 672

Moving on to step 8:
When dividing 5491 by 672, we get 8 with a remainder of 115.
The next digit of our result is 8. 
Result so far: 18818.0
If we subtract 5376 from 5491, we get 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Let's proceed to step 9:
672 goes into 1150 1 times with a remainder of 478.
Use 1 as the next digit of our solution. 
Result so far: 18818.1
The remainder is 478 after subtracting 672 from 1150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4780, and continue the process.

Moving on to step 10:
When dividing 4780 by 672, we get 7 with a remainder of 76.
The number 7 becomes the next digit in our result. 
Result so far: 18818.17
If we take 4704 away from 4780, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Going ahead to step 11:
If we divide 760 by 672, we get 1 and a remainder of 88.
Record the quotient 1 as the next digit in the result. 
Result so far: 18818.171
Deduct 672 from 760 and we're left with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Moving on to step 12:
If we divide 880 by 672, we get 1 and a remainder of 208.
Use 1 as the next digit of our solution. 
Result so far: 18818.1711
If we take 672 away from 880, we end up with 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

The final outcome is 18818.1711, with a leftover of 0.00208.