644351 divided by 5 
Let's see how many times 5 fits into 644351.

On to step 1:
When dividing 6 by 5, we get 1 with a remainder of 1.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 5 from 6, we get 1.
Include the next digit (4) from the dividend after 1, then repeat: 14 / 5

On to step 2:
When dividing 14 by 5, we get 2 with a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtract 10 from 14 to get 4.
Fetch the next digit (4) from the dividend, attach it to 4 and continue: 44 / 5

Going ahead to step 3:
When dividing 44 by 5, we get 8 with a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 128.0
Deduct 40 from 44 and we're left with 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 5

Let's proceed to step 4:
5 can be fit into 43 8 times, resulting in a remainder of 3.
Put 8 as the next digit of the answer. 
Result so far: 1288.0
If we take 40 away from 43, we end up with 3.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 5

Moving on to step 5:
The number 5 fits into 35 7 times, leaving a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 12887.0
Deduct 35 from 35 and we're left with 0.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 5

Moving on to step 6:
The number 5 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 128870.0
Subtract 0 from 1 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
5 can be fit into 10 2 times, resulting in a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 128870.2
If we take 10 away from 10, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
0 divided by 5 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 128870.2
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
When dividing 0 by 5, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 128870.2
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 128870.2, and the remainder is 0.0.