Evaluate:
`4.5 xx5`

Answer

To evaluate \( 4.5 \times 5 \), we can follow these steps:

### Step 1: Multiply the whole number with the decimal
We start by multiplying \( 4.5 \) by \( 5 \).

\[ 4.5 \times 5 \]

### Step 2: Break down the multiplication
We can break down \( 4.5 \) into \( 4 \) and \( 0.5 \) to make the multiplication easier.

\[ (4 + 0.5) \times 5 = (4 \times 5) + (0.5 \times 5) \]

### Step 3: Calculate \( 4 \times 5 \)
Now, calculate \( 4 \times 5 \):

\[ 4 \times 5 = 20 \]

### Step 4: Calculate \( 0.5 \times 5 \)
Next, calculate \( 0.5 \times 5 \):

\[ 0.5 \times 5 = 2.5 \]

### Step 5: Add the results
Now, add the results from Step 3 and Step 4:

\[ 20 + 2.5 = 22.5 \]

### Final Answer
Thus, the final answer is:

\[ \boxed{22.5} \]

---