We look at the division of 728833 by 21 
We're looking to find how many times 21 goes into 728833.

Let's proceed to step 1:
The number 21 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (2) from the dividend and append it to 7, then repeat: 72 / 21

Advancing to step 2:
The number 21 fits into 72 3 times, leaving a remainder of 9.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 63 from 72 and we're left with 9.
Bring next digit (8) of the dividend behind the 9 and repeat the process: 98 / 21

Step 3:
The number 21 fits into 98 4 times, leaving a remainder of 14.
Write down 4 as next digit of the result. 
Result so far: 34.0
The remainder is 14 after subtracting 84 from 98.
Bring next digit (8) of the dividend behind the 14 and repeat the process: 148 / 21

Moving on to step 4:
The number 21 fits into 148 7 times, leaving a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 347.0
If we take 147 away from 148, we end up with 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 21

Advancing to step 5:
21 goes into 13 0 times with a remainder of 13.
Put 0 as the next digit of the answer. 
Result so far: 3470.0
Subtract 0 from 13 to get 13.
Include the next digit (3) from the dividend after 13, then repeat: 133 / 21

Step 6:
When dividing 133 by 21, we get 6 with a remainder of 7.
The next digit of our result is 6. 
Result so far: 34706.0
If we subtract 126 from 133, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 7:
70 divided by 21 is 3 with a remainder of 7.
The next digit of our result is 3. 
Result so far: 34706.3
If we take 63 away from 70, 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 8:
The number 21 fits into 70 3 times, leaving a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 34706.33
Subtracting 63 from 70 leaves us 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.

After the division, we end up with 34706.33 and a remainder of 0.007.