98688490 ÷ 638 
We want to divide 98688490 by 638.

On to step 1:
When dividing 9 by 638, we get 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 638

Let's proceed to step 2:
638 goes into 98 0 times with a remainder of 98.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 98 and we're left with 98.
Take the next digit (6) from the dividend and append it to 98, then repeat: 986 / 638

On to step 3:
638 goes into 986 1 times with a remainder of 348.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 638 away from 986, we end up with 348.
Grab the next digit (8) from the dividend, add it to 348, then carry on: 3488 / 638

Moving on to step 4:
638 goes into 3488 5 times with a remainder of 298.
Write down 5 as next digit of the result. 
Result so far: 15.0
Subtract 3190 from 3488 to get 298.
Include the next digit (8) from the dividend after 298, then repeat: 2988 / 638

Advancing to step 5:
638 can be fit into 2988 4 times, resulting in a remainder of 436.
The number 4 becomes the next digit in our result. 
Result so far: 154.0
Deduct 2552 from 2988 and we're left with 436.
Take the next digit (4) from the dividend and append it to 436, then repeat: 4364 / 638

Let's proceed to step 6:
The number 638 fits into 4364 6 times, leaving a remainder of 536.
Write down 6 as next digit of the result. 
Result so far: 1546.0
If we subtract 3828 from 4364, we get 536.
Bring next digit (9) of the dividend behind the 536 and repeat the process: 5369 / 638

Moving on to step 7:
638 can be fit into 5369 8 times, resulting in a remainder of 265.
Put 8 as the next digit of the answer. 
Result so far: 15468.0
If we subtract 5104 from 5369, we get 265.
Grab the next digit (0) from the dividend, add it to 265, then carry on: 2650 / 638

On to step 8:
2650 divided by 638 is 4 with a remainder of 98.
The next digit of our result is 4. 
Result so far: 154684.0
If we take 2552 away from 2650, we end up with 98.
Since there are no more digits in the dividend, we add a zero to the remainder making it 980, and continue the process.

Going ahead to step 9:
If we divide 980 by 638, we get 1 and a remainder of 342.
Record the quotient 1 as the next digit in the result. 
Result so far: 154684.1
If we subtract 638 from 980, we get 342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

Advancing to step 10:
638 goes into 3420 5 times with a remainder of 230.
Use 5 as the next digit of our solution. 
Result so far: 154684.15
If we subtract 3190 from 3420, we get 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Let's proceed to step 11:
When dividing 2300 by 638, we get 3 with a remainder of 386.
Use 3 as the next digit of our solution. 
Result so far: 154684.153
Subtracting 1914 from 2300 leaves us with 386.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3860, and continue the process.

Step 12:
If we divide 3860 by 638, we get 6 and a remainder of 32.
Put 6 as the next digit of the answer. 
Result so far: 154684.1536
Subtracting 3828 from 3860 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 13:
When dividing 320 by 638, we get 0 with a remainder of 320.
Use 0 as the next digit of our solution. 
Result so far: 154684.1536
If we subtract 0 from 320, we 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.

On to step 14:
If we divide 3200 by 638, we get 5 and a remainder of 10.
The next digit of our result is 5. 
Result so far: 154684.153605
Subtracting 3190 from 3200 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 15:
638 can be fit into 100 0 times, resulting in a remainder of 100.
The next digit of our result is 0. 
Result so far: 154684.153605
Deduct 0 from 100 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Advancing to step 16:
If we divide 1000 by 638, we get 1 and a remainder of 362.
The number 1 becomes the next digit in our result. 
Result so far: 154684.15360501
If we subtract 638 from 1000, we get 362.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3620, and continue the process.

The final outcome is 154684.15360501, with a leftover of 3.62e-07.