We're dividing 642154 by 50 
We want to divide 642154 by 50.

On to step 1:
The number 50 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 50

Moving on to step 2:
If we divide 64 by 50, we get 1 and a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 50 away from 64, we end up with 14.
Append the next digit (2) from the dividend to 14 and continue with: 142 / 50

Moving on to step 3:
When dividing 142 by 50, we get 2 with a remainder of 42.
The next digit of our result is 2. 
Result so far: 12.0
If we take 100 away from 142, we end up with 42.
Include the next digit (1) from the dividend after 42, then repeat: 421 / 50

Step 4:
When dividing 421 by 50, we get 8 with a remainder of 21.
Use 8 as the next digit of our solution. 
Result so far: 128.0
Deduct 400 from 421 and we're left with 21.
Bring next digit (5) of the dividend behind the 21 and repeat the process: 215 / 50

Step 5:
When dividing 215 by 50, we get 4 with a remainder of 15.
The number 4 becomes the next digit in our result. 
Result so far: 1284.0
If we take 200 away from 215, we end up with 15.
Fetch the next digit (4) from the dividend, attach it to 15 and continue: 154 / 50

On to step 6:
50 can be fit into 154 3 times, resulting in a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 12843.0
If we subtract 150 from 154, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 7:
The number 50 fits into 40 0 times, leaving a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 12843.0
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 8:
50 goes into 400 8 times with a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 12843.08
If we subtract 400 from 400, 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.

Step 9:
When dividing 0 by 50, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 12843.08
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.

On to step 10:
When dividing 0 by 50, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 12843.08
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.

After the division, we end up with 12843.08 and a remainder of 0.0.