25493512 ÷ 648 
Our goal is to divide 25493512 by 648.

Going ahead to step 1:
When dividing 2 by 648, we get 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 648

Step 2:
648 can be fit into 25 0 times, resulting in a remainder of 25.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 25 to get 25.
Fetch the next digit (4) from the dividend, attach it to 25 and continue: 254 / 648

On to step 3:
When dividing 254 by 648, we get 0 with a remainder of 254.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 254 to get 254.
Grab the next digit (9) from the dividend, add it to 254, then carry on: 2549 / 648

Let's proceed to step 4:
648 can be fit into 2549 3 times, resulting in a remainder of 605.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtracting 1944 from 2549 leaves us with 605.
Take the next digit (3) from the dividend and append it to 605, then repeat: 6053 / 648

Advancing to step 5:
648 goes into 6053 9 times with a remainder of 221.
The next digit of our result is 9. 
Result so far: 39.0
Subtract 5832 from 6053 to get 221.
Take the next digit (5) from the dividend and append it to 221, then repeat: 2215 / 648

Going ahead to step 6:
2215 divided by 648 is 3 with a remainder of 271.
Record the quotient 3 as the next digit in the result. 
Result so far: 393.0
If we subtract 1944 from 2215, we get 271.
Include the next digit (1) from the dividend after 271, then repeat: 2711 / 648

Step 7:
648 can be fit into 2711 4 times, resulting in a remainder of 119.
Put 4 as the next digit of the answer. 
Result so far: 3934.0
Deduct 2592 from 2711 and we're left with 119.
Take the next digit (2) from the dividend and append it to 119, then repeat: 1192 / 648

Let's proceed to step 8:
1192 divided by 648 is 1 with a remainder of 544.
The number 1 becomes the next digit in our result. 
Result so far: 39341.0
If we subtract 648 from 1192, we get 544.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5440, and continue the process.

Going ahead to step 9:
When dividing 5440 by 648, we get 8 with a remainder of 256.
Put 8 as the next digit of the answer. 
Result so far: 39341.8
If we take 5184 away from 5440, we end up with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Moving on to step 10:
When dividing 2560 by 648, we get 3 with a remainder of 616.
The next digit of our result is 3. 
Result so far: 39341.83
Deduct 1944 from 2560 and we're left with 616.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6160, and continue the process.

Step 11:
When dividing 6160 by 648, we get 9 with a remainder of 328.
Put 9 as the next digit of the answer. 
Result so far: 39341.839
If we take 5832 away from 6160, we end up with 328.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

On to step 12:
The number 648 fits into 3280 5 times, leaving a remainder of 40.
Put 5 as the next digit of the answer. 
Result so far: 39341.8395
Subtract 3240 from 3280 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 13:
If we divide 400 by 648, we get 0 and a remainder of 400.
Write down 0 as next digit of the result. 
Result so far: 39341.8395
Subtract 0 from 400 to get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Step 14:
648 goes into 4000 6 times with a remainder of 112.
The number 6 becomes the next digit in our result. 
Result so far: 39341.839506
If we take 3888 away from 4000, we end up with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Let's proceed to step 15:
If we divide 1120 by 648, we get 1 and a remainder of 472.
The next digit of our result is 1. 
Result so far: 39341.8395061
If we take 648 away from 1120, we end up with 472.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4720, and continue the process.

Let's proceed to step 16:
648 goes into 4720 7 times with a remainder of 184.
Record the quotient 7 as the next digit in the result. 
Result so far: 39341.83950617
If we subtract 4536 from 4720, we get 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

After the division, we end up with 39341.83950617 and a remainder of 1.84e-07.