We're dividing 15209318 by 639 
We want to divide 15209318 by 639.

On to step 1:
639 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 639

Going ahead to step 2:
639 goes into 15 0 times with a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Fetch the next digit (2) from the dividend, attach it to 15 and continue: 152 / 639

Going ahead to step 3:
When dividing 152 by 639, we get 0 with a remainder of 152.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 152, we end up with 152.
Append the next digit (0) from the dividend to 152 and continue with: 1520 / 639

Let's proceed to step 4:
639 can be fit into 1520 2 times, resulting in a remainder of 242.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 1278 from 1520 and we're left with 242.
Fetch the next digit (9) from the dividend, attach it to 242 and continue: 2429 / 639

On to step 5:
639 can be fit into 2429 3 times, resulting in a remainder of 512.
Put 3 as the next digit of the answer. 
Result so far: 23.0
Deduct 1917 from 2429 and we're left with 512.
Fetch the next digit (3) from the dividend, attach it to 512 and continue: 5123 / 639

Moving on to step 6:
5123 divided by 639 is 8 with a remainder of 11.
The next digit of our result is 8. 
Result so far: 238.0
Subtracting 5112 from 5123 leaves us with 11.
Take the next digit (1) from the dividend and append it to 11, then repeat: 111 / 639

On to step 7:
If we divide 111 by 639, we get 0 and a remainder of 111.
The next digit of our result is 0. 
Result so far: 2380.0
The remainder is 111 after subtracting 0 from 111.
Include the next digit (8) from the dividend after 111, then repeat: 1118 / 639

Step 8:
1118 divided by 639 is 1 with a remainder of 479.
Write down 1 as next digit of the result. 
Result so far: 23801.0
Deduct 639 from 1118 and we're left with 479.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4790, and continue the process.

Going ahead to step 9:
When dividing 4790 by 639, we get 7 with a remainder of 317.
Record the quotient 7 as the next digit in the result. 
Result so far: 23801.7
The remainder is 317 after subtracting 4473 from 4790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3170, and continue the process.

Advancing to step 10:
When dividing 3170 by 639, we get 4 with a remainder of 614.
Write down 4 as next digit of the result. 
Result so far: 23801.74
If we subtract 2556 from 3170, we get 614.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6140, and continue the process.

Let's proceed to step 11:
639 goes into 6140 9 times with a remainder of 389.
Put 9 as the next digit of the answer. 
Result so far: 23801.749
Subtracting 5751 from 6140 leaves us with 389.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3890, and continue the process.

Let's proceed to step 12:
When dividing 3890 by 639, we get 6 with a remainder of 56.
The next digit of our result is 6. 
Result so far: 23801.7496
If we subtract 3834 from 3890, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 13:
If we divide 560 by 639, we get 0 and a remainder of 560.
The number 0 becomes the next digit in our result. 
Result so far: 23801.7496
Subtracting 0 from 560 leaves us with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Going ahead to step 14:
The number 639 fits into 5600 8 times, leaving a remainder of 488.
The number 8 becomes the next digit in our result. 
Result so far: 23801.749608
Deduct 5112 from 5600 and we're left 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.

Going ahead to step 15:
The number 639 fits into 4880 7 times, leaving a remainder of 407.
Record the quotient 7 as the next digit in the result. 
Result so far: 23801.7496087
The remainder is 407 after subtracting 4473 from 4880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4070, and continue the process.

Moving on to step 16:
When dividing 4070 by 639, we get 6 with a remainder of 236.
Use 6 as the next digit of our solution. 
Result so far: 23801.74960876
The remainder is 236 after subtracting 3834 from 4070.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2360, and continue the process.

The final outcome is 23801.74960876, with a leftover of 2.36e-07.