We're dividing 430489 by 20 
We want to figure out the number of times 430489 can be divided by 20.

Step 1:
When dividing 4 by 20, we get 0 with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 20

Step 2:
20 can be fit into 43 2 times, resulting in a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 40 from 43 to get 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 20

On to step 3:
When dividing 30 by 20, we get 1 with a remainder of 10.
Write down 1 as next digit of the result. 
Result so far: 21.0
If we take 20 away from 30, we end up with 10.
Take the next digit (4) from the dividend and append it to 10, then repeat: 104 / 20

Going ahead to step 4:
20 goes into 104 5 times with a remainder of 4.
The number 5 becomes the next digit in our result. 
Result so far: 215.0
Deduct 100 from 104 and we're left with 4.
Include the next digit (8) from the dividend after 4, then repeat: 48 / 20

Moving on to step 5:
The number 20 fits into 48 2 times, leaving a remainder of 8.
The next digit of our result is 2. 
Result so far: 2152.0
Deduct 40 from 48 and we're left with 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 20

Step 6:
20 can be fit into 89 4 times, resulting in a remainder of 9.
Write down 4 as next digit of the result. 
Result so far: 21524.0
Subtracting 80 from 89 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
The number 20 fits into 90 4 times, leaving a remainder of 10.
Write down 4 as next digit of the result. 
Result so far: 21524.4
The remainder is 10 after subtracting 80 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
20 goes into 100 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 21524.45
If we take 100 away from 100, 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.

Step 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 21524.45
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.

Advancing to step 10:
When dividing 0 by 20, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 21524.45
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.

Our division results in 21524.45 with a remaining 0.0.