30971900 divided by 639 
We want to divide 30971900 by 639.

Step 1:
639 goes into 3 0 times with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 639

Let's proceed to step 2:
30 divided by 639 is 0 with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 30 and we're left with 30.
Fetch the next digit (9) from the dividend, attach it to 30 and continue: 309 / 639

Step 3:
If we divide 309 by 639, we get 0 and a remainder of 309.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 309 after subtracting 0 from 309.
Include the next digit (7) from the dividend after 309, then repeat: 3097 / 639

Going ahead to step 4:
639 can be fit into 3097 4 times, resulting in a remainder of 541.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 541 after subtracting 2556 from 3097.
Bring next digit (1) of the dividend behind the 541 and repeat the process: 5411 / 639

On to step 5:
639 can be fit into 5411 8 times, resulting in a remainder of 299.
Use 8 as the next digit of our solution. 
Result so far: 48.0
Deduct 5112 from 5411 and we're left with 299.
Take the next digit (9) from the dividend and append it to 299, then repeat: 2999 / 639

Advancing to step 6:
The number 639 fits into 2999 4 times, leaving a remainder of 443.
The number 4 becomes the next digit in our result. 
Result so far: 484.0
If we take 2556 away from 2999, we end up with 443.
Append the next digit (0) from the dividend to 443 and continue with: 4430 / 639

Let's proceed to step 7:
When dividing 4430 by 639, we get 6 with a remainder of 596.
The number 6 becomes the next digit in our result. 
Result so far: 4846.0
Subtract 3834 from 4430 to get 596.
Take the next digit (0) from the dividend and append it to 596, then repeat: 5960 / 639

Moving on to step 8:
When dividing 5960 by 639, we get 9 with a remainder of 209.
The number 9 becomes the next digit in our result. 
Result so far: 48469.0
Deduct 5751 from 5960 and we're left with 209.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2090, and continue the process.

Advancing to step 9:
If we divide 2090 by 639, we get 3 and a remainder of 173.
Write down 3 as next digit of the result. 
Result so far: 48469.3
Deduct 1917 from 2090 and we're left with 173.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1730, and continue the process.

Let's proceed to step 10:
When dividing 1730 by 639, we get 2 with a remainder of 452.
Use 2 as the next digit of our solution. 
Result so far: 48469.32
Subtract 1278 from 1730 to get 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

Moving on to step 11:
639 goes into 4520 7 times with a remainder of 47.
Put 7 as the next digit of the answer. 
Result so far: 48469.327
Deduct 4473 from 4520 and we're left with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 12:
The number 639 fits into 470 0 times, leaving a remainder of 470.
Record the quotient 0 as the next digit in the result. 
Result so far: 48469.327
The remainder is 470 after subtracting 0 from 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

On to step 13:
When dividing 4700 by 639, we get 7 with a remainder of 227.
The number 7 becomes the next digit in our result. 
Result so far: 48469.32707
Subtracting 4473 from 4700 leaves us with 227.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2270, and continue the process.

Step 14:
639 goes into 2270 3 times with a remainder of 353.
The next digit of our result is 3. 
Result so far: 48469.327073
Deduct 1917 from 2270 and we're left with 353.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3530, and continue the process.

Advancing to step 15:
The number 639 fits into 3530 5 times, leaving a remainder of 335.
Write down 5 as next digit of the result. 
Result so far: 48469.3270735
Subtracting 3195 from 3530 leaves us with 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Going ahead to step 16:
When dividing 3350 by 639, we get 5 with a remainder of 155.
Record the quotient 5 as the next digit in the result. 
Result so far: 48469.32707355
Subtract 3195 from 3350 to get 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

The final outcome is 48469.32707355, with a leftover of 1.55e-07.