Let's divide 97728871 by 639
Let's see how many times 639 fits into 97728871.

Moving on to step 1:
If we divide 9 by 639, we get 0 and a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Grab the next digit (7) from the dividend, add it to 9, then carry on: 97 / 639

Step 2:
639 goes into 97 0 times with a remainder of 97.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 97 after subtracting 0 from 97.
Fetch the next digit (7) from the dividend, attach it to 97 and continue: 977 / 639

Going ahead to step 3:
The number 639 fits into 977 1 times, leaving a remainder of 338.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 639 from 977, we get 338.
Fetch the next digit (2) from the dividend, attach it to 338 and continue: 3382 / 639

Moving on to step 4:
When dividing 3382 by 639, we get 5 with a remainder of 187.
Put 5 as the next digit of the answer. 
Result so far: 15.0
Deduct 3195 from 3382 and we're left with 187.
Take the next digit (8) from the dividend and append it to 187, then repeat: 1878 / 639

Moving on to step 5:
639 can be fit into 1878 2 times, resulting in a remainder of 600.
Use 2 as the next digit of our solution. 
Result so far: 152.0
Deduct 1278 from 1878 and we're left with 600.
Bring next digit (8) of the dividend behind the 600 and repeat the process: 6008 / 639

On to step 6:
6008 divided by 639 is 9 with a remainder of 257.
Put 9 as the next digit of the answer. 
Result so far: 1529.0
Subtract 5751 from 6008 to get 257.
Bring next digit (7) of the dividend behind the 257 and repeat the process: 2577 / 639

Let's proceed to step 7:
If we divide 2577 by 639, we get 4 and a remainder of 21.
The number 4 becomes the next digit in our result. 
Result so far: 15294.0
Subtracting 2556 from 2577 leaves us with 21.
Grab the next digit (1) from the dividend, add it to 21, then carry on: 211 / 639

Moving on to step 8:
The number 639 fits into 211 0 times, leaving a remainder of 211.
Put 0 as the next digit of the answer. 
Result so far: 152940.0
If we subtract 0 from 211, we get 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

Going ahead to step 9:
639 goes into 2110 3 times with a remainder of 193.
Put 3 as the next digit of the answer. 
Result so far: 152940.3
The remainder is 193 after subtracting 1917 from 2110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1930, and continue the process.

Advancing to step 10:
The number 639 fits into 1930 3 times, leaving a remainder of 13.
The next digit of our result is 3. 
Result so far: 152940.33
If we subtract 1917 from 1930, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The final outcome is 152940.33, with a leftover of 0.013.