31990700 ÷ 639 
Our goal is to divide 31990700 by 639.

Step 1:
The number 639 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 639

Let's proceed to step 2:
When dividing 31 by 639, we get 0 with a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 31 leaves us with 31.
Include the next digit (9) from the dividend after 31, then repeat: 319 / 639

Let's proceed to step 3:
319 divided by 639 is 0 with a remainder of 319.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 319 leaves us with 319.
Bring next digit (9) of the dividend behind the 319 and repeat the process: 3199 / 639

On to step 4:
3199 divided by 639 is 5 with a remainder of 4.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Subtract 3195 from 3199 to get 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 639

Let's proceed to step 5:
40 divided by 639 is 0 with a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 50.0
The remainder is 40 after subtracting 0 from 40.
Bring next digit (7) of the dividend behind the 40 and repeat the process: 407 / 639

Step 6:
If we divide 407 by 639, we get 0 and a remainder of 407.
Use 0 as the next digit of our solution. 
Result so far: 500.0
Subtract 0 from 407 to get 407.
Include the next digit (0) from the dividend after 407, then repeat: 4070 / 639

Going ahead to step 7:
4070 divided by 639 is 6 with a remainder of 236.
The next digit of our result is 6. 
Result so far: 5006.0
Subtracting 3834 from 4070 leaves us with 236.
Grab the next digit (0) from the dividend, add it to 236, then carry on: 2360 / 639

Moving on to step 8:
2360 divided by 639 is 3 with a remainder of 443.
Write down 3 as next digit of the result. 
Result so far: 50063.0
Deduct 1917 from 2360 and we're left with 443.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4430, and continue the process.

On to step 9:
639 goes into 4430 6 times with a remainder of 596.
The number 6 becomes the next digit in our result. 
Result so far: 50063.6
Subtract 3834 from 4430 to get 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Let's proceed to step 10:
639 can be fit into 5960 9 times, resulting in a remainder of 209.
The next digit of our result is 9. 
Result so far: 50063.69
The remainder is 209 after subtracting 5751 from 5960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2090, and continue the process.

Going ahead to step 11:
2090 divided by 639 is 3 with a remainder of 173.
Use 3 as the next digit of our solution. 
Result so far: 50063.693
Subtract 1917 from 2090 to get 173.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1730, and continue the process.

On to step 12:
1730 divided by 639 is 2 with a remainder of 452.
Record the quotient 2 as the next digit in the result. 
Result so far: 50063.6932
Subtracting 1278 from 1730 leaves us with 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

Step 13:
639 goes into 4520 7 times with a remainder of 47.
The next digit of our result is 7. 
Result so far: 50063.69327
Subtract 4473 from 4520 to get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Step 14:
639 goes into 470 0 times with a remainder of 470.
The next digit of our result is 0. 
Result so far: 50063.69327
If we subtract 0 from 470, we get 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Step 15:
The number 639 fits into 4700 7 times, leaving a remainder of 227.
Write down 7 as next digit of the result. 
Result so far: 50063.6932707
If we subtract 4473 from 4700, we get 227.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2270, and continue the process.

Advancing to step 16:
639 goes into 2270 3 times with a remainder of 353.
Write down 3 as next digit of the result. 
Result so far: 50063.69327073
If we subtract 1917 from 2270, we get 353.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3530, and continue the process.

Our division results in 50063.69327073 with a remaining 3.53e-07.