644621 ÷ 50 
We're looking to find how many times 50 goes into 644621.

Let's proceed to step 1:
If we divide 6 by 50, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 50

Going ahead to step 2:
50 can be fit into 64 1 times, resulting in a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 14 after subtracting 50 from 64.
Fetch the next digit (4) from the dividend, attach it to 14 and continue: 144 / 50

Going ahead to step 3:
144 divided by 50 is 2 with a remainder of 44.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
If we subtract 100 from 144, we get 44.
Grab the next digit (6) from the dividend, add it to 44, then carry on: 446 / 50

Advancing to step 4:
50 goes into 446 8 times with a remainder of 46.
Record the quotient 8 as the next digit in the result. 
Result so far: 128.0
Deduct 400 from 446 and we're left with 46.
Fetch the next digit (2) from the dividend, attach it to 46 and continue: 462 / 50

Moving on to step 5:
If we divide 462 by 50, we get 9 and a remainder of 12.
The next digit of our result is 9. 
Result so far: 1289.0
Subtract 450 from 462 to get 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 50

Going ahead to step 6:
If we divide 121 by 50, we get 2 and a remainder of 21.
The next digit of our result is 2. 
Result so far: 12892.0
Subtract 100 from 121 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 7:
210 divided by 50 is 4 with a remainder of 10.
Use 4 as the next digit of our solution. 
Result so far: 12892.4
Deduct 200 from 210 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
50 goes into 100 2 times with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 12892.42
Deduct 100 from 100 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.

Step 9:
If we divide 0 by 50, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 12892.42
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.

On to step 10:
If we divide 0 by 50, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 12892.42
If we subtract 0 from 0, we 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.

The final outcome is 12892.42, with a leftover of 0.0.