12452258 divided by 648 
We want to figure out the number of times 12452258 can be divided by 648.

Going ahead to step 1:
648 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 648

On to step 2:
648 can be fit into 12 0 times, resulting in a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Bring next digit (4) of the dividend behind the 12 and repeat the process: 124 / 648

Let's proceed to step 3:
The number 648 fits into 124 0 times, leaving a remainder of 124.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 124 leaves us with 124.
Include the next digit (5) from the dividend after 124, then repeat: 1245 / 648

Advancing to step 4:
648 goes into 1245 1 times with a remainder of 597.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 648 from 1245 and we're left with 597.
Fetch the next digit (2) from the dividend, attach it to 597 and continue: 5972 / 648

On to step 5:
5972 divided by 648 is 9 with a remainder of 140.
Write down 9 as next digit of the result. 
Result so far: 19.0
The remainder is 140 after subtracting 5832 from 5972.
Include the next digit (2) from the dividend after 140, then repeat: 1402 / 648

On to step 6:
648 can be fit into 1402 2 times, resulting in a remainder of 106.
The next digit of our result is 2. 
Result so far: 192.0
Subtracting 1296 from 1402 leaves us with 106.
Fetch the next digit (5) from the dividend, attach it to 106 and continue: 1065 / 648

Step 7:
648 can be fit into 1065 1 times, resulting in a remainder of 417.
The next digit of our result is 1. 
Result so far: 1921.0
Deduct 648 from 1065 and we're left with 417.
Fetch the next digit (8) from the dividend, attach it to 417 and continue: 4178 / 648

Step 8:
When dividing 4178 by 648, we get 6 with a remainder of 290.
The next digit of our result is 6. 
Result so far: 19216.0
Subtract 3888 from 4178 to get 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Let's proceed to step 9:
648 can be fit into 2900 4 times, resulting in a remainder of 308.
Write down 4 as next digit of the result. 
Result so far: 19216.4
Subtract 2592 from 2900 to get 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

On to step 10:
3080 divided by 648 is 4 with a remainder of 488.
The number 4 becomes the next digit in our result. 
Result so far: 19216.44
Subtracting 2592 from 3080 leaves us with 488.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4880, and continue the process.

The final outcome is 19216.44, with a leftover of 0.488.