645128 divided by 12 
Our goal is to divide 645128 by 12.

Let's proceed to step 1:
When dividing 6 by 12, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 12

Advancing to step 2:
64 divided by 12 is 5 with a remainder of 4.
Write down 5 as next digit of the result. 
Result so far: 5.0
Subtracting 60 from 64 leaves us with 4.
Fetch the next digit (5) from the dividend, attach it to 4 and continue: 45 / 12

Let's proceed to step 3:
If we divide 45 by 12, we get 3 and a remainder of 9.
Put 3 as the next digit of the answer. 
Result so far: 53.0
If we subtract 36 from 45, we get 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 12

Going ahead to step 4:
When dividing 91 by 12, we get 7 with a remainder of 7.
Write down 7 as next digit of the result. 
Result so far: 537.0
The remainder is 7 after subtracting 84 from 91.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 12

On to step 5:
When dividing 72 by 12, we get 6 with a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 5376.0
Subtract 72 from 72 to get 0.
Include the next digit (8) from the dividend after 0, then repeat: 8 / 12

Going ahead to step 6:
If we divide 8 by 12, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 53760.0
If we subtract 0 from 8, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 7:
12 can be fit into 80 6 times, resulting in a remainder of 8.
The next digit of our result is 6. 
Result so far: 53760.6
Deduct 72 from 80 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 8:
12 goes into 80 6 times with a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 53760.66
The remainder is 8 after subtracting 72 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 53760.66, with a leftover of 0.008.