We look at the division of 421292 by 20 
We're looking to find how many times 20 goes into 421292.

Step 1:
If we divide 4 by 20, we get 0 and a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 20

On to step 2:
42 divided by 20 is 2 with a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 40 away from 42, we end up with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 20

Advancing to step 3:
When dividing 21 by 20, we get 1 with a remainder of 1.
The next digit of our result is 1. 
Result so far: 21.0
Subtract 20 from 21 to get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 20

Going ahead to step 4:
The number 20 fits into 12 0 times, leaving a remainder of 12.
The next digit of our result is 0. 
Result so far: 210.0
The remainder is 12 after subtracting 0 from 12.
Include the next digit (9) from the dividend after 12, then repeat: 129 / 20

Advancing to step 5:
20 can be fit into 129 6 times, resulting in a remainder of 9.
Put 6 as the next digit of the answer. 
Result so far: 2106.0
If we take 120 away from 129, we end up with 9.
Take the next digit (2) from the dividend and append it to 9, then repeat: 92 / 20

Going ahead to step 6:
When dividing 92 by 20, we get 4 with a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 21064.0
The remainder is 12 after subtracting 80 from 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 7:
20 can be fit into 120 6 times, resulting in a remainder of 0.
The next digit of our result is 6. 
Result so far: 21064.6
If we subtract 120 from 120, 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.

Moving on to step 8:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 21064.6
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.

On to step 9:
0 divided by 20 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 21064.6
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.

The final result is 21064.6 with a remainder of 0.0.