We divide 638840 by 13
We want to figure out the number of times 638840 can be divided by 13.

Advancing to step 1:
When dividing 6 by 13, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 13

Moving on to step 2:
13 goes into 63 4 times with a remainder of 11.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 52 away from 63, we end up with 11.
Include the next digit (8) from the dividend after 11, then repeat: 118 / 13

On to step 3:
13 can be fit into 118 9 times, resulting in a remainder of 1.
The next digit of our result is 9. 
Result so far: 49.0
Subtracting 117 from 118 leaves us with 1.
Include the next digit (8) from the dividend after 1, then repeat: 18 / 13

Moving on to step 4:
If we divide 18 by 13, we get 1 and a remainder of 5.
Use 1 as the next digit of our solution. 
Result so far: 491.0
Subtracting 13 from 18 leaves us with 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 13

Let's proceed to step 5:
The number 13 fits into 54 4 times, leaving a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 4914.0
Deduct 52 from 54 and we're left with 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 13

Step 6:
13 can be fit into 20 1 times, resulting in a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 49141.0
Subtracting 13 from 20 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 7:
13 can be fit into 70 5 times, resulting in a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 49141.5
If we subtract 65 from 70, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 8:
13 can be fit into 50 3 times, resulting in a remainder of 11.
Put 3 as the next digit of the answer. 
Result so far: 49141.53
If we take 39 away from 50, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 9:
110 divided by 13 is 8 with a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 49141.538
Deduct 104 from 110 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 10:
13 can be fit into 60 4 times, resulting in a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 49141.5384
If we take 52 away from 60, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 11:
The number 13 fits into 80 6 times, leaving a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 49141.53846
If we take 78 away from 80, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 12:
20 divided by 13 is 1 with a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 49141.538461
Subtract 13 from 20 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 13:
70 divided by 13 is 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 49141.5384615
If we take 65 away from 70, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 14:
13 can be fit into 50 3 times, resulting in a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 49141.53846153
If we subtract 39 from 50, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

After the division, we end up with 49141.53846153 and a remainder of 1.1e-08.