644750 divided by 13 
We want to figure out the number of times 644750 can be divided by 13.

On to step 1:
If we divide 6 by 13, we get 0 and 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 (4) of the dividend behind the 6 and repeat the process: 64 / 13

On to step 2:
13 goes into 64 4 times with a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 52 away from 64, we end up with 12.
Take the next digit (4) from the dividend and append it to 12, then repeat: 124 / 13

On to step 3:
If we divide 124 by 13, we get 9 and a remainder of 7.
Put 9 as the next digit of the answer. 
Result so far: 49.0
Deduct 117 from 124 and we're left with 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 13

On to step 4:
13 can be fit into 77 5 times, resulting in a remainder of 12.
The number 5 becomes the next digit in our result. 
Result so far: 495.0
If we take 65 away from 77, we end up with 12.
Take the next digit (5) from the dividend and append it to 12, then repeat: 125 / 13

Going ahead to step 5:
13 can be fit into 125 9 times, resulting in a remainder of 8.
The number 9 becomes the next digit in our result. 
Result so far: 4959.0
If we take 117 away from 125, we end up with 8.
Include the next digit (0) from the dividend after 8, then repeat: 80 / 13

On to step 6:
If we divide 80 by 13, we get 6 and a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 49596.0
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.

On to step 7:
If we divide 20 by 13, we get 1 and a remainder of 7.
The next digit of our result is 1. 
Result so far: 49596.1
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.

Going ahead to step 8:
The number 13 fits into 70 5 times, leaving a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 49596.15
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.

Let's proceed to step 9:
50 divided by 13 is 3 with a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 49596.153
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.

Moving on to step 10:
When dividing 110 by 13, we get 8 with a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 49596.1538
Subtracting 104 from 110 leaves us 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.

On to step 11:
13 can be fit into 60 4 times, resulting in a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 49596.15384
Subtracting 52 from 60 leaves us 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 12:
80 divided by 13 is 6 with a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 49596.153846
Deduct 78 from 80 and we're left 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.

Moving on to step 13:
The number 13 fits into 20 1 times, leaving a remainder of 7.
The next digit of our result is 1. 
Result so far: 49596.1538461
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.

Step 14:
When dividing 70 by 13, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 49596.15384615
The remainder is 5 after subtracting 65 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 49596.15384615, with a leftover of 5e-09.