664021 ÷ 13 
We want to figure out the number of times 664021 can be divided by 13.

Advancing to step 1:
The number 13 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 13

Step 2:
66 divided by 13 is 5 with a remainder of 1.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtracting 65 from 66 leaves us with 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 13

On to step 3:
14 divided by 13 is 1 with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 51.0
Subtract 13 from 14 to get 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 13

Going ahead to step 4:
13 can be fit into 10 0 times, resulting in a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 510.0
Subtracting 0 from 10 leaves us with 10.
Include the next digit (2) from the dividend after 10, then repeat: 102 / 13

On to step 5:
When dividing 102 by 13, we get 7 with a remainder of 11.
Put 7 as the next digit of the answer. 
Result so far: 5107.0
Subtracting 91 from 102 leaves us with 11.
Bring next digit (1) of the dividend behind the 11 and repeat the process: 111 / 13

Let's proceed to step 6:
When dividing 111 by 13, we get 8 with a remainder of 7.
Record the quotient 8 as the next digit in the result. 
Result so far: 51078.0
If we subtract 104 from 111, we 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.

On to step 7:
70 divided by 13 is 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 51078.5
Subtracting 65 from 70 leaves us 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.

On to step 8:
When dividing 50 by 13, we get 3 with a remainder of 11.
Use 3 as the next digit of our solution. 
Result so far: 51078.53
Deduct 39 from 50 and we're left 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.

Advancing to step 9:
The number 13 fits into 110 8 times, leaving a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 51078.538
Subtract 104 from 110 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 10:
When dividing 60 by 13, we get 4 with a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 51078.5384
If we subtract 52 from 60, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 11:
13 goes into 80 6 times with a remainder of 2.
Write down 6 as next digit of the result. 
Result so far: 51078.53846
Subtracting 78 from 80 leaves us 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:
If we divide 20 by 13, we get 1 and a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 51078.538461
The remainder is 7 after subtracting 13 from 20.
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 13:
13 can be fit into 70 5 times, resulting in a remainder of 5.
The next digit of our result is 5. 
Result so far: 51078.5384615
Subtract 65 from 70 to 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.

Going ahead to step 14:
When dividing 50 by 13, we get 3 with a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 51078.53846153
The remainder is 11 after subtracting 39 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

The final outcome is 51078.53846153, with a leftover of 1.1e-08.