We divide 644559 by 10
We're looking to find how many times 10 goes into 644559.

On to step 1:
10 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 10

Advancing to step 2:
If we divide 64 by 10, we get 6 and a remainder of 4.
The next digit of our result is 6. 
Result so far: 6.0
If we subtract 60 from 64, we get 4.
Grab the next digit (4) from the dividend, add it to 4, then carry on: 44 / 10

On to step 3:
44 divided by 10 is 4 with a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 64.0
The remainder is 4 after subtracting 40 from 44.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 10

Advancing to step 4:
45 divided by 10 is 4 with a remainder of 5.
Put 4 as the next digit of the answer. 
Result so far: 644.0
Subtracting 40 from 45 leaves us with 5.
Append the next digit (5) from the dividend to 5 and continue with: 55 / 10

Going ahead to step 5:
When dividing 55 by 10, we get 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 6445.0
Subtract 50 from 55 to get 5.
Grab the next digit (9) from the dividend, add it to 5, then carry on: 59 / 10

Moving on to step 6:
If we divide 59 by 10, we get 5 and a remainder of 9.
Record the quotient 5 as the next digit in the result. 
Result so far: 64455.0
Subtract 50 from 59 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 7:
The number 10 fits into 90 9 times, leaving a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 64455.9
Subtract 90 from 90 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
The number 10 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 64455.9
Subtracting 0 from 0 leaves us 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.

Advancing to step 9:
0 divided by 10 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 64455.9
Deduct 0 from 0 and we're left 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.

After the division, we end up with 64455.9 and a remainder of 0.0.