We look at the division of 10099769 by 639 
We want to divide 10099769 by 639.

Going ahead to step 1:
The number 639 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 639

Moving on to step 2:
639 goes into 10 0 times with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 10 to get 10.
Include the next digit (0) from the dividend after 10, then repeat: 100 / 639

Moving on to step 3:
The number 639 fits into 100 0 times, leaving a remainder of 100.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 100, we get 100.
Bring next digit (9) of the dividend behind the 100 and repeat the process: 1009 / 639

Let's proceed to step 4:
639 can be fit into 1009 1 times, resulting in a remainder of 370.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 639 from 1009 leaves us with 370.
Fetch the next digit (9) from the dividend, attach it to 370 and continue: 3709 / 639

Moving on to step 5:
If we divide 3709 by 639, we get 5 and a remainder of 514.
Write down 5 as next digit of the result. 
Result so far: 15.0
Subtracting 3195 from 3709 leaves us with 514.
Include the next digit (7) from the dividend after 514, then repeat: 5147 / 639

Step 6:
5147 divided by 639 is 8 with a remainder of 35.
Write down 8 as next digit of the result. 
Result so far: 158.0
The remainder is 35 after subtracting 5112 from 5147.
Fetch the next digit (6) from the dividend, attach it to 35 and continue: 356 / 639

On to step 7:
If we divide 356 by 639, we get 0 and a remainder of 356.
Use 0 as the next digit of our solution. 
Result so far: 1580.0
Subtract 0 from 356 to get 356.
Fetch the next digit (9) from the dividend, attach it to 356 and continue: 3569 / 639

Let's proceed to step 8:
3569 divided by 639 is 5 with a remainder of 374.
The next digit of our result is 5. 
Result so far: 15805.0
The remainder is 374 after subtracting 3195 from 3569.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3740, and continue the process.

Moving on to step 9:
The number 639 fits into 3740 5 times, leaving a remainder of 545.
The next digit of our result is 5. 
Result so far: 15805.5
Subtracting 3195 from 3740 leaves us with 545.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5450, and continue the process.

On to step 10:
639 can be fit into 5450 8 times, resulting in a remainder of 338.
The next digit of our result is 8. 
Result so far: 15805.58
Subtract 5112 from 5450 to get 338.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3380, and continue the process.

Step 11:
The number 639 fits into 3380 5 times, leaving a remainder of 185.
The next digit of our result is 5. 
Result so far: 15805.585
Subtracting 3195 from 3380 leaves us with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Going ahead to step 12:
If we divide 1850 by 639, we get 2 and a remainder of 572.
Use 2 as the next digit of our solution. 
Result so far: 15805.5852
Subtracting 1278 from 1850 leaves us with 572.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5720, and continue the process.

On to step 13:
639 can be fit into 5720 8 times, resulting in a remainder of 608.
Put 8 as the next digit of the answer. 
Result so far: 15805.58528
Deduct 5112 from 5720 and we're left with 608.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6080, and continue the process.

Step 14:
639 goes into 6080 9 times with a remainder of 329.
Use 9 as the next digit of our solution. 
Result so far: 15805.585289
The remainder is 329 after subtracting 5751 from 6080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3290, and continue the process.

Step 15:
639 can be fit into 3290 5 times, resulting in a remainder of 95.
Put 5 as the next digit of the answer. 
Result so far: 15805.5852895
Subtract 3195 from 3290 to get 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Advancing to step 16:
950 divided by 639 is 1 with a remainder of 311.
Put 1 as the next digit of the answer. 
Result so far: 15805.58528951
Subtracting 639 from 950 leaves us with 311.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3110, and continue the process.

The final result is 15805.58528951 with a remainder of 3.11e-07.