643139 divided by 28 
We want to divide 643139 by 28.

Let's proceed to step 1:
28 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 28

Step 2:
64 divided by 28 is 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 56 from 64 leaves us with 8.
Grab the next digit (3) from the dividend, add it to 8, then carry on: 83 / 28

Step 3:
When dividing 83 by 28, we get 2 with a remainder of 27.
The next digit of our result is 2. 
Result so far: 22.0
If we take 56 away from 83, we end up with 27.
Bring next digit (1) of the dividend behind the 27 and repeat the process: 271 / 28

Step 4:
If we divide 271 by 28, we get 9 and a remainder of 19.
Use 9 as the next digit of our solution. 
Result so far: 229.0
If we subtract 252 from 271, we get 19.
Bring next digit (3) of the dividend behind the 19 and repeat the process: 193 / 28

Advancing to step 5:
The number 28 fits into 193 6 times, leaving a remainder of 25.
Record the quotient 6 as the next digit in the result. 
Result so far: 2296.0
If we subtract 168 from 193, we get 25.
Bring next digit (9) of the dividend behind the 25 and repeat the process: 259 / 28

Moving on to step 6:
28 goes into 259 9 times with a remainder of 7.
Record the quotient 9 as the next digit in the result. 
Result so far: 22969.0
If we take 252 away from 259, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 7:
70 divided by 28 is 2 with a remainder of 14.
Write down 2 as next digit of the result. 
Result so far: 22969.2
If we take 56 away from 70, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 8:
The number 28 fits into 140 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 22969.25
If we take 140 away from 140, 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.

Let's proceed to step 9:
0 divided by 28 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 22969.25
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.

Let's proceed to step 10:
The number 28 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 22969.25
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.

Our division results in 22969.25 with a remaining 0.0.