We're dividing 25408683 by 640 
Our goal is to divide 25408683 by 640.

Step 1:
When dividing 2 by 640, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 640

On to step 2:
The number 640 fits into 25 0 times, leaving a remainder of 25.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 25 and we're left with 25.
Take the next digit (4) from the dividend and append it to 25, then repeat: 254 / 640

On to step 3:
640 goes into 254 0 times with a remainder of 254.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 254 leaves us with 254.
Take the next digit (0) from the dividend and append it to 254, then repeat: 2540 / 640

Moving on to step 4:
If we divide 2540 by 640, we get 3 and a remainder of 620.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 1920 from 2540 and we're left with 620.
Include the next digit (8) from the dividend after 620, then repeat: 6208 / 640

Moving on to step 5:
The number 640 fits into 6208 9 times, leaving a remainder of 448.
Write down 9 as next digit of the result. 
Result so far: 39.0
Subtract 5760 from 6208 to get 448.
Include the next digit (6) from the dividend after 448, then repeat: 4486 / 640

Moving on to step 6:
640 goes into 4486 7 times with a remainder of 6.
Record the quotient 7 as the next digit in the result. 
Result so far: 397.0
Subtracting 4480 from 4486 leaves us with 6.
Include the next digit (8) from the dividend after 6, then repeat: 68 / 640

On to step 7:
When dividing 68 by 640, we get 0 with a remainder of 68.
Record the quotient 0 as the next digit in the result. 
Result so far: 3970.0
Subtract 0 from 68 to get 68.
Append the next digit (3) from the dividend to 68 and continue with: 683 / 640

Advancing to step 8:
When dividing 683 by 640, we get 1 with a remainder of 43.
Record the quotient 1 as the next digit in the result. 
Result so far: 39701.0
If we take 640 away from 683, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 9:
640 goes into 430 0 times with a remainder of 430.
Put 0 as the next digit of the answer. 
Result so far: 39701.0
Deduct 0 from 430 and we're left with 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Step 10:
4300 divided by 640 is 6 with a remainder of 460.
Put 6 as the next digit of the answer. 
Result so far: 39701.06
If we take 3840 away from 4300, we end up with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

On to step 11:
If we divide 4600 by 640, we get 7 and a remainder of 120.
The number 7 becomes the next digit in our result. 
Result so far: 39701.067
If we subtract 4480 from 4600, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Let's proceed to step 12:
The number 640 fits into 1200 1 times, leaving a remainder of 560.
The number 1 becomes the next digit in our result. 
Result so far: 39701.0671
If we subtract 640 from 1200, we get 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Let's proceed to step 13:
The number 640 fits into 5600 8 times, leaving a remainder of 480.
Write down 8 as next digit of the result. 
Result so far: 39701.06718
Subtract 5120 from 5600 to get 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

On to step 14:
640 can be fit into 4800 7 times, resulting in a remainder of 320.
Use 7 as the next digit of our solution. 
Result so far: 39701.067187
Deduct 4480 from 4800 and we're left with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Let's proceed to step 15:
3200 divided by 640 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 39701.0671875
If we subtract 3200 from 3200, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 16:
640 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 39701.0671875
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 39701.0671875, with a leftover of 0.0.