We're dividing 13875580 by 639 
We're looking to find how many times 639 goes into 13875580.

Step 1:
1 divided by 639 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 639

Going ahead to step 2:
The number 639 fits into 13 0 times, leaving a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 13 and we're left with 13.
Include the next digit (8) from the dividend after 13, then repeat: 138 / 639

Advancing to step 3:
639 can be fit into 138 0 times, resulting in a remainder of 138.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 138, we get 138.
Bring next digit (7) of the dividend behind the 138 and repeat the process: 1387 / 639

Let's proceed to step 4:
1387 divided by 639 is 2 with a remainder of 109.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtract 1278 from 1387 to get 109.
Include the next digit (5) from the dividend after 109, then repeat: 1095 / 639

Going ahead to step 5:
When dividing 1095 by 639, we get 1 with a remainder of 456.
Write down 1 as next digit of the result. 
Result so far: 21.0
Subtract 639 from 1095 to get 456.
Fetch the next digit (5) from the dividend, attach it to 456 and continue: 4565 / 639

Moving on to step 6:
The number 639 fits into 4565 7 times, leaving a remainder of 92.
Write down 7 as next digit of the result. 
Result so far: 217.0
Subtract 4473 from 4565 to get 92.
Bring next digit (8) of the dividend behind the 92 and repeat the process: 928 / 639

Advancing to step 7:
When dividing 928 by 639, we get 1 with a remainder of 289.
The next digit of our result is 1. 
Result so far: 2171.0
Subtracting 639 from 928 leaves us with 289.
Fetch the next digit (0) from the dividend, attach it to 289 and continue: 2890 / 639

Going ahead to step 8:
639 goes into 2890 4 times with a remainder of 334.
Record the quotient 4 as the next digit in the result. 
Result so far: 21714.0
If we take 2556 away from 2890, we end up with 334.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3340, and continue the process.

Going ahead to step 9:
639 goes into 3340 5 times with a remainder of 145.
Write down 5 as next digit of the result. 
Result so far: 21714.5
If we subtract 3195 from 3340, we get 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Step 10:
The number 639 fits into 1450 2 times, leaving a remainder of 172.
Put 2 as the next digit of the answer. 
Result so far: 21714.52
The remainder is 172 after subtracting 1278 from 1450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Advancing to step 11:
When dividing 1720 by 639, we get 2 with a remainder of 442.
Put 2 as the next digit of the answer. 
Result so far: 21714.522
If we take 1278 away from 1720, we end up with 442.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4420, and continue the process.

The final outcome is 21714.522, with a leftover of 0.0442.