We look at the division of 43445 by 20 
We want to figure out the number of times 43445 can be divided by 20.

Step 1:
The number 20 fits into 4 0 times, leaving a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 20

Step 2:
When dividing 43 by 20, we get 2 with a remainder of 3.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 3 after subtracting 40 from 43.
Include the next digit (4) from the dividend after 3, then repeat: 34 / 20

Step 3:
20 can be fit into 34 1 times, resulting in a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 21.0
If we take 20 away from 34, we end up with 14.
Include the next digit (4) from the dividend after 14, then repeat: 144 / 20

Advancing to step 4:
20 can be fit into 144 7 times, resulting in a remainder of 4.
Write down 7 as next digit of the result. 
Result so far: 217.0
Deduct 140 from 144 and we're left with 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 20

On to step 5:
20 can be fit into 45 2 times, resulting in a remainder of 5.
The next digit of our result is 2. 
Result so far: 2172.0
If we subtract 40 from 45, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 6:
20 goes into 50 2 times with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 2172.2
If we subtract 40 from 50, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 7:
20 can be fit into 100 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 2172.25
Deduct 100 from 100 and we're left 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.

Going ahead to step 8:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 2172.25
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.

Let's proceed to step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 2172.25
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.

The final result is 2172.25 with a remainder of 0.0.