We're dividing 99902821 by 639 
We're looking to find how many times 639 goes into 99902821.

Moving on to step 1:
If we divide 9 by 639, we get 0 and a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 639

Let's proceed to step 2:
99 divided by 639 is 0 with a remainder of 99.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 99 after subtracting 0 from 99.
Append the next digit (9) from the dividend to 99 and continue with: 999 / 639

Going ahead to step 3:
When dividing 999 by 639, we get 1 with a remainder of 360.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 639 from 999 and we're left with 360.
Bring next digit (0) of the dividend behind the 360 and repeat the process: 3600 / 639

Let's proceed to step 4:
639 can be fit into 3600 5 times, resulting in a remainder of 405.
Write down 5 as next digit of the result. 
Result so far: 15.0
Deduct 3195 from 3600 and we're left with 405.
Append the next digit (2) from the dividend to 405 and continue with: 4052 / 639

Step 5:
4052 divided by 639 is 6 with a remainder of 218.
Record the quotient 6 as the next digit in the result. 
Result so far: 156.0
If we subtract 3834 from 4052, we get 218.
Fetch the next digit (8) from the dividend, attach it to 218 and continue: 2188 / 639

Advancing to step 6:
If we divide 2188 by 639, we get 3 and a remainder of 271.
Record the quotient 3 as the next digit in the result. 
Result so far: 1563.0
The remainder is 271 after subtracting 1917 from 2188.
Append the next digit (2) from the dividend to 271 and continue with: 2712 / 639

Moving on to step 7:
639 goes into 2712 4 times with a remainder of 156.
Write down 4 as next digit of the result. 
Result so far: 15634.0
The remainder is 156 after subtracting 2556 from 2712.
Append the next digit (1) from the dividend to 156 and continue with: 1561 / 639

Step 8:
639 goes into 1561 2 times with a remainder of 283.
Record the quotient 2 as the next digit in the result. 
Result so far: 156342.0
Subtract 1278 from 1561 to get 283.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2830, and continue the process.

Advancing to step 9:
639 goes into 2830 4 times with a remainder of 274.
Use 4 as the next digit of our solution. 
Result so far: 156342.4
Subtract 2556 from 2830 to get 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

Let's proceed to step 10:
The number 639 fits into 2740 4 times, leaving a remainder of 184.
Use 4 as the next digit of our solution. 
Result so far: 156342.44
If we take 2556 away from 2740, we end up with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

After the division, we end up with 156342.44 and a remainder of 0.184.