Let's divide 15490423 by 640
We want to divide 15490423 by 640.

Going ahead to step 1:
If we divide 1 by 640, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 640

Going ahead to step 2:
640 can be fit into 15 0 times, resulting in a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Take the next digit (4) from the dividend and append it to 15, then repeat: 154 / 640

Let's proceed to step 3:
640 can be fit into 154 0 times, resulting in a remainder of 154.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 154 and we're left with 154.
Include the next digit (9) from the dividend after 154, then repeat: 1549 / 640

Going ahead to step 4:
640 can be fit into 1549 2 times, resulting in a remainder of 269.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 1280 from 1549, we get 269.
Grab the next digit (0) from the dividend, add it to 269, then carry on: 2690 / 640

On to step 5:
The number 640 fits into 2690 4 times, leaving a remainder of 130.
Put 4 as the next digit of the answer. 
Result so far: 24.0
If we take 2560 away from 2690, we end up with 130.
Include the next digit (4) from the dividend after 130, then repeat: 1304 / 640

Moving on to step 6:
1304 divided by 640 is 2 with a remainder of 24.
Put 2 as the next digit of the answer. 
Result so far: 242.0
The remainder is 24 after subtracting 1280 from 1304.
Take the next digit (2) from the dividend and append it to 24, then repeat: 242 / 640

Advancing to step 7:
When dividing 242 by 640, we get 0 with a remainder of 242.
The number 0 becomes the next digit in our result. 
Result so far: 2420.0
Subtracting 0 from 242 leaves us with 242.
Include the next digit (3) from the dividend after 242, then repeat: 2423 / 640

Going ahead to step 8:
If we divide 2423 by 640, we get 3 and a remainder of 503.
Write down 3 as next digit of the result. 
Result so far: 24203.0
Subtracting 1920 from 2423 leaves us with 503.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5030, and continue the process.

Step 9:
640 can be fit into 5030 7 times, resulting in a remainder of 550.
Use 7 as the next digit of our solution. 
Result so far: 24203.7
The remainder is 550 after subtracting 4480 from 5030.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5500, and continue the process.

Advancing to step 10:
The number 640 fits into 5500 8 times, leaving a remainder of 380.
The number 8 becomes the next digit in our result. 
Result so far: 24203.78
Subtracting 5120 from 5500 leaves us with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Moving on to step 11:
When dividing 3800 by 640, we get 5 with a remainder of 600.
The next digit of our result is 5. 
Result so far: 24203.785
If we take 3200 away from 3800, we end up with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

Step 12:
The number 640 fits into 6000 9 times, leaving a remainder of 240.
Put 9 as the next digit of the answer. 
Result so far: 24203.7859
If we take 5760 away from 6000, we end up with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Moving on to step 13:
When dividing 2400 by 640, we get 3 with a remainder of 480.
The number 3 becomes the next digit in our result. 
Result so far: 24203.78593
Subtract 1920 from 2400 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.

Advancing to step 14:
640 can be fit into 4800 7 times, resulting in a remainder of 320.
Record the quotient 7 as the next digit in the result. 
Result so far: 24203.785937
Subtract 4480 from 4800 to get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Going ahead to step 15:
3200 divided by 640 is 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 24203.7859375
Deduct 3200 from 3200 and we're left with 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: 24203.7859375
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.

The final outcome is 24203.7859375, with a leftover of 0.0.