We look at the division of 422793 by 21 
We want to divide 422793 by 21.

Moving on to step 1:
4 divided by 21 is 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 21

On to step 2:
When dividing 42 by 21, we get 2 with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 0 after subtracting 42 from 42.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 21

Advancing to step 3:
When dividing 2 by 21, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 20.0
If we subtract 0 from 2, we get 2.
Take the next digit (7) from the dividend and append it to 2, then repeat: 27 / 21

On to step 4:
If we divide 27 by 21, we get 1 and a remainder of 6.
Write down 1 as next digit of the result. 
Result so far: 201.0
If we take 21 away from 27, we end up with 6.
Bring next digit (9) of the dividend behind the 6 and repeat the process: 69 / 21

On to step 5:
The number 21 fits into 69 3 times, leaving a remainder of 6.
The next digit of our result is 3. 
Result so far: 2013.0
If we subtract 63 from 69, we get 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 21

Going ahead to step 6:
If we divide 63 by 21, we get 3 and a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 20133.0
The remainder is 0 after subtracting 63 from 63.
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 7:
0 divided by 21 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 20133.0
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.

Step 8:
If we divide 0 by 21, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 20133.0
Subtract 0 from 0 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.

The final result is 20133.0 with a remainder of 0.0.