71800468 ÷ 639 
We want to divide 71800468 by 639.

Let's proceed to step 1:
639 goes into 7 0 times with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Bring next digit (1) of the dividend behind the 7 and repeat the process: 71 / 639

Step 2:
The number 639 fits into 71 0 times, leaving a remainder of 71.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 71 to get 71.
Include the next digit (8) from the dividend after 71, then repeat: 718 / 639

Going ahead to step 3:
718 divided by 639 is 1 with a remainder of 79.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 639 from 718, we get 79.
Append the next digit (0) from the dividend to 79 and continue with: 790 / 639

Going ahead to step 4:
If we divide 790 by 639, we get 1 and a remainder of 151.
Write down 1 as next digit of the result. 
Result so far: 11.0
The remainder is 151 after subtracting 639 from 790.
Append the next digit (0) from the dividend to 151 and continue with: 1510 / 639

On to step 5:
639 can be fit into 1510 2 times, resulting in a remainder of 232.
The next digit of our result is 2. 
Result so far: 112.0
Subtract 1278 from 1510 to get 232.
Include the next digit (4) from the dividend after 232, then repeat: 2324 / 639

Moving on to step 6:
If we divide 2324 by 639, we get 3 and a remainder of 407.
Put 3 as the next digit of the answer. 
Result so far: 1123.0
If we take 1917 away from 2324, we end up with 407.
Bring next digit (6) of the dividend behind the 407 and repeat the process: 4076 / 639

Moving on to step 7:
If we divide 4076 by 639, we get 6 and a remainder of 242.
Record the quotient 6 as the next digit in the result. 
Result so far: 11236.0
If we take 3834 away from 4076, we end up with 242.
Grab the next digit (8) from the dividend, add it to 242, then carry on: 2428 / 639

On to step 8:
If we divide 2428 by 639, we get 3 and a remainder of 511.
The next digit of our result is 3. 
Result so far: 112363.0
Subtracting 1917 from 2428 leaves us with 511.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5110, and continue the process.

Let's proceed to step 9:
When dividing 5110 by 639, we get 7 with a remainder of 637.
Put 7 as the next digit of the answer. 
Result so far: 112363.7
Subtracting 4473 from 5110 leaves us with 637.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6370, and continue the process.

Step 10:
639 can be fit into 6370 9 times, resulting in a remainder of 619.
The number 9 becomes the next digit in our result. 
Result so far: 112363.79
Subtract 5751 from 6370 to get 619.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6190, and continue the process.

On to step 11:
639 goes into 6190 9 times with a remainder of 439.
The next digit of our result is 9. 
Result so far: 112363.799
If we subtract 5751 from 6190, we get 439.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4390, and continue the process.

The final result is 112363.799 with a remainder of 0.0439.