We're dividing 13085599 by 640 
Our goal is to divide 13085599 by 640.

Going ahead to step 1:
The number 640 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 640

Moving on to step 2:
The number 640 fits into 13 0 times, leaving a remainder of 13.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 13 and we're left with 13.
Bring next digit (0) of the dividend behind the 13 and repeat the process: 130 / 640

Advancing to step 3:
130 divided by 640 is 0 with a remainder of 130.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 130, we end up with 130.
Bring next digit (8) of the dividend behind the 130 and repeat the process: 1308 / 640

Moving on to step 4:
640 goes into 1308 2 times with a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 1280 from 1308, we get 28.
Fetch the next digit (5) from the dividend, attach it to 28 and continue: 285 / 640

Advancing to step 5:
640 goes into 285 0 times with a remainder of 285.
Put 0 as the next digit of the answer. 
Result so far: 20.0
Deduct 0 from 285 and we're left with 285.
Bring next digit (5) of the dividend behind the 285 and repeat the process: 2855 / 640

Moving on to step 6:
640 can be fit into 2855 4 times, resulting in a remainder of 295.
Write down 4 as next digit of the result. 
Result so far: 204.0
If we subtract 2560 from 2855, we get 295.
Fetch the next digit (9) from the dividend, attach it to 295 and continue: 2959 / 640

Let's proceed to step 7:
2959 divided by 640 is 4 with a remainder of 399.
Use 4 as the next digit of our solution. 
Result so far: 2044.0
Deduct 2560 from 2959 and we're left with 399.
Append the next digit (9) from the dividend to 399 and continue with: 3999 / 640

Going ahead to step 8:
640 can be fit into 3999 6 times, resulting in a remainder of 159.
Write down 6 as next digit of the result. 
Result so far: 20446.0
Subtracting 3840 from 3999 leaves us with 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

Step 9:
1590 divided by 640 is 2 with a remainder of 310.
Write down 2 as next digit of the result. 
Result so far: 20446.2
If we subtract 1280 from 1590, we get 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Step 10:
The number 640 fits into 3100 4 times, leaving a remainder of 540.
The next digit of our result is 4. 
Result so far: 20446.24
Subtracting 2560 from 3100 leaves us with 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Going ahead to step 11:
640 goes into 5400 8 times with a remainder of 280.
The next digit of our result is 8. 
Result so far: 20446.248
Subtract 5120 from 5400 to get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Moving on to step 12:
2800 divided by 640 is 4 with a remainder of 240.
The next digit of our result is 4. 
Result so far: 20446.2484
If we subtract 2560 from 2800, we get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Going ahead to step 13:
When dividing 2400 by 640, we get 3 with a remainder of 480.
The next digit of our result is 3. 
Result so far: 20446.24843
If we take 1920 away from 2400, we end up with 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:
4800 divided by 640 is 7 with a remainder of 320.
The number 7 becomes the next digit in our result. 
Result so far: 20446.248437
If we take 4480 away from 4800, we end up 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:
The number 640 fits into 3200 5 times, leaving a remainder of 0.
The next digit of our result is 5. 
Result so far: 20446.2484375
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:
If we divide 0 by 640, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 20446.2484375
If we subtract 0 from 0, 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.

Our division results in 20446.2484375 with a remaining 0.0.