40090206 ÷ 639 
We want to figure out the number of times 40090206 can be divided by 639.

Let's proceed to step 1:
639 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 639

Step 2:
40 divided by 639 is 0 with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 40 and we're left with 40.
Grab the next digit (0) from the dividend, add it to 40, then carry on: 400 / 639

Moving on to step 3:
The number 639 fits into 400 0 times, leaving a remainder of 400.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 400, we end up with 400.
Grab the next digit (9) from the dividend, add it to 400, then carry on: 4009 / 639

Let's proceed to step 4:
4009 divided by 639 is 6 with a remainder of 175.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
If we subtract 3834 from 4009, we get 175.
Fetch the next digit (0) from the dividend, attach it to 175 and continue: 1750 / 639

Moving on to step 5:
1750 divided by 639 is 2 with a remainder of 472.
Put 2 as the next digit of the answer. 
Result so far: 62.0
The remainder is 472 after subtracting 1278 from 1750.
Include the next digit (2) from the dividend after 472, then repeat: 4722 / 639

Step 6:
The number 639 fits into 4722 7 times, leaving a remainder of 249.
Record the quotient 7 as the next digit in the result. 
Result so far: 627.0
If we subtract 4473 from 4722, we get 249.
Include the next digit (0) from the dividend after 249, then repeat: 2490 / 639

On to step 7:
639 can be fit into 2490 3 times, resulting in a remainder of 573.
Put 3 as the next digit of the answer. 
Result so far: 6273.0
Subtract 1917 from 2490 to get 573.
Bring next digit (6) of the dividend behind the 573 and repeat the process: 5736 / 639

Going ahead to step 8:
The number 639 fits into 5736 8 times, leaving a remainder of 624.
Put 8 as the next digit of the answer. 
Result so far: 62738.0
Subtracting 5112 from 5736 leaves us with 624.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6240, and continue the process.

Going ahead to step 9:
6240 divided by 639 is 9 with a remainder of 489.
Record the quotient 9 as the next digit in the result. 
Result so far: 62738.9
Deduct 5751 from 6240 and we're left with 489.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4890, and continue the process.

Step 10:
When dividing 4890 by 639, we get 7 with a remainder of 417.
Use 7 as the next digit of our solution. 
Result so far: 62738.97
Subtracting 4473 from 4890 leaves us with 417.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4170, and continue the process.

Going ahead to step 11:
639 can be fit into 4170 6 times, resulting in a remainder of 336.
Write down 6 as next digit of the result. 
Result so far: 62738.976
Deduct 3834 from 4170 and we're left with 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Advancing to step 12:
If we divide 3360 by 639, we get 5 and a remainder of 165.
Record the quotient 5 as the next digit in the result. 
Result so far: 62738.9765
The remainder is 165 after subtracting 3195 from 3360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

On to step 13:
When dividing 1650 by 639, we get 2 with a remainder of 372.
Record the quotient 2 as the next digit in the result. 
Result so far: 62738.97652
If we subtract 1278 from 1650, we get 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Advancing to step 14:
If we divide 3720 by 639, we get 5 and a remainder of 525.
The next digit of our result is 5. 
Result so far: 62738.976525
If we take 3195 away from 3720, we end up with 525.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5250, and continue the process.

Going ahead to step 15:
5250 divided by 639 is 8 with a remainder of 138.
The number 8 becomes the next digit in our result. 
Result so far: 62738.9765258
Subtracting 5112 from 5250 leaves us with 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Step 16:
The number 639 fits into 1380 2 times, leaving a remainder of 102.
Use 2 as the next digit of our solution. 
Result so far: 62738.97652582
Deduct 1278 from 1380 and we're left with 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

After the division, we end up with 62738.97652582 and a remainder of 1.02e-07.