We divide 80509781 by 638
We're looking to find how many times 638 goes into 80509781.

Step 1:
8 divided by 638 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (0) from the dividend after 8, then repeat: 80 / 638

Going ahead to step 2:
The number 638 fits into 80 0 times, leaving a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 80, we get 80.
Bring next digit (5) of the dividend behind the 80 and repeat the process: 805 / 638

Going ahead to step 3:
638 can be fit into 805 1 times, resulting in a remainder of 167.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 638 away from 805, we end up with 167.
Grab the next digit (0) from the dividend, add it to 167, then carry on: 1670 / 638

On to step 4:
638 can be fit into 1670 2 times, resulting in a remainder of 394.
Use 2 as the next digit of our solution. 
Result so far: 12.0
If we subtract 1276 from 1670, we get 394.
Grab the next digit (9) from the dividend, add it to 394, then carry on: 3949 / 638

Going ahead to step 5:
638 can be fit into 3949 6 times, resulting in a remainder of 121.
Write down 6 as next digit of the result. 
Result so far: 126.0
Subtracting 3828 from 3949 leaves us with 121.
Append the next digit (7) from the dividend to 121 and continue with: 1217 / 638

Advancing to step 6:
638 can be fit into 1217 1 times, resulting in a remainder of 579.
Put 1 as the next digit of the answer. 
Result so far: 1261.0
Subtract 638 from 1217 to get 579.
Grab the next digit (8) from the dividend, add it to 579, then carry on: 5798 / 638

Step 7:
638 goes into 5798 9 times with a remainder of 56.
Use 9 as the next digit of our solution. 
Result so far: 12619.0
Deduct 5742 from 5798 and we're left with 56.
Fetch the next digit (1) from the dividend, attach it to 56 and continue: 561 / 638

Moving on to step 8:
If we divide 561 by 638, we get 0 and a remainder of 561.
The number 0 becomes the next digit in our result. 
Result so far: 126190.0
Deduct 0 from 561 and we're left with 561.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5610, and continue the process.

Moving on to step 9:
638 can be fit into 5610 8 times, resulting in a remainder of 506.
The next digit of our result is 8. 
Result so far: 126190.8
If we take 5104 away from 5610, we end up with 506.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5060, and continue the process.

Step 10:
If we divide 5060 by 638, we get 7 and a remainder of 594.
The next digit of our result is 7. 
Result so far: 126190.87
If we subtract 4466 from 5060, we get 594.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5940, and continue the process.

Advancing to step 11:
If we divide 5940 by 638, we get 9 and a remainder of 198.
Write down 9 as next digit of the result. 
Result so far: 126190.879
If we take 5742 away from 5940, we end up with 198.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1980, and continue the process.

Let's proceed to step 12:
638 can be fit into 1980 3 times, resulting in a remainder of 66.
Record the quotient 3 as the next digit in the result. 
Result so far: 126190.8793
Subtracting 1914 from 1980 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 13:
If we divide 660 by 638, we get 1 and a remainder of 22.
Put 1 as the next digit of the answer. 
Result so far: 126190.87931
Subtract 638 from 660 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 14:
638 goes into 220 0 times with a remainder of 220.
Put 0 as the next digit of the answer. 
Result so far: 126190.87931
Subtract 0 from 220 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Advancing to step 15:
When dividing 2200 by 638, we get 3 with a remainder of 286.
The next digit of our result is 3. 
Result so far: 126190.8793103
If we take 1914 away from 2200, we end up with 286.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

Going ahead to step 16:
638 goes into 2860 4 times with a remainder of 308.
The number 4 becomes the next digit in our result. 
Result so far: 126190.87931034
If we subtract 2552 from 2860, we get 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

The final outcome is 126190.87931034, with a leftover of 3.08e-07.