We look at the division of 420888 by 20 
We want to figure out the number of times 420888 can be divided by 20.

Moving on to step 1:
20 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 20

Step 2:
If we divide 42 by 20, we get 2 and a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 40 from 42 leaves us with 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 20

Step 3:
20 can be fit into 20 1 times, resulting in a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 21.0
If we take 20 away from 20, we end up with 0.
Take the next digit (8) from the dividend and append it to 0, then repeat: 8 / 20

On to step 4:
When dividing 8 by 20, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 210.0
Subtract 0 from 8 to get 8.
Take the next digit (8) from the dividend and append it to 8, then repeat: 88 / 20

Step 5:
88 divided by 20 is 4 with a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 2104.0
The remainder is 8 after subtracting 80 from 88.
Fetch the next digit (8) from the dividend, attach it to 8 and continue: 88 / 20

Moving on to step 6:
20 can be fit into 88 4 times, resulting in a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 21044.0
Subtract 80 from 88 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 7:
If we divide 80 by 20, we get 4 and a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 21044.4
Subtracting 80 from 80 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.

Advancing to step 8:
When dividing 0 by 20, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 21044.4
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.

Moving on to step 9:
0 divided by 20 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 21044.4
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 quotient of the division is 21044.4, and the remainder is 0.0.