We're dividing 17389434 by 638 
We want to figure out the number of times 17389434 can be divided by 638.

Let's proceed to step 1:
When dividing 1 by 638, we get 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 638

On to step 2:
When dividing 17 by 638, we get 0 with a remainder of 17.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 17, we end up with 17.
Grab the next digit (3) from the dividend, add it to 17, then carry on: 173 / 638

Advancing to step 3:
The number 638 fits into 173 0 times, leaving a remainder of 173.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 173, we end up with 173.
Grab the next digit (8) from the dividend, add it to 173, then carry on: 1738 / 638

Going ahead to step 4:
If we divide 1738 by 638, we get 2 and a remainder of 462.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 1276 from 1738 and we're left with 462.
Bring next digit (9) of the dividend behind the 462 and repeat the process: 4629 / 638

Going ahead to step 5:
When dividing 4629 by 638, we get 7 with a remainder of 163.
The next digit of our result is 7. 
Result so far: 27.0
Deduct 4466 from 4629 and we're left with 163.
Grab the next digit (4) from the dividend, add it to 163, then carry on: 1634 / 638

Let's proceed to step 6:
638 can be fit into 1634 2 times, resulting in a remainder of 358.
The next digit of our result is 2. 
Result so far: 272.0
If we subtract 1276 from 1634, we get 358.
Take the next digit (3) from the dividend and append it to 358, then repeat: 3583 / 638

Going ahead to step 7:
The number 638 fits into 3583 5 times, leaving a remainder of 393.
The next digit of our result is 5. 
Result so far: 2725.0
Subtracting 3190 from 3583 leaves us with 393.
Include the next digit (4) from the dividend after 393, then repeat: 3934 / 638

Going ahead to step 8:
3934 divided by 638 is 6 with a remainder of 106.
Record the quotient 6 as the next digit in the result. 
Result so far: 27256.0
If we subtract 3828 from 3934, we get 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Step 9:
If we divide 1060 by 638, we get 1 and a remainder of 422.
Use 1 as the next digit of our solution. 
Result so far: 27256.1
Subtract 638 from 1060 to get 422.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4220, and continue the process.

Advancing to step 10:
638 can be fit into 4220 6 times, resulting in a remainder of 392.
The number 6 becomes the next digit in our result. 
Result so far: 27256.16
If we take 3828 away from 4220, we end up with 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

On to step 11:
3920 divided by 638 is 6 with a remainder of 92.
Record the quotient 6 as the next digit in the result. 
Result so far: 27256.166
If we take 3828 away from 3920, we end up with 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

After the division, we end up with 27256.166 and a remainder of 0.0092.