Multiply :
`0.3xx1000`

Answer

To solve the multiplication of \(0.3 \times 1000\), follow these steps:

### Step 1: Write the decimal in fractional form
We can express \(0.3\) as a fraction:
\[ 0.3 = \frac{3}{10} \]

### Step 2: Set up the multiplication
Now, we can rewrite the multiplication:
\[ 0.3 \times 1000 = \frac{3}{10} \times 1000 \]

### Step 3: Multiply the fraction by 1000
When multiplying a fraction by a whole number, you can multiply the numerator by the whole number:
\[ \frac{3 \times 1000}{10} \]

### Step 4: Simplify the multiplication
Now, calculate \(3 \times 1000\):
\[ 3 \times 1000 = 3000 \]
So, we have:
\[ \frac{3000}{10} \]

### Step 5: Divide by 10
Now, divide \(3000\) by \(10\):
\[ \frac{3000}{10} = 300 \]

### Final Answer
Thus, the result of multiplying \(0.3\) by \(1000\) is:
\[ \boxed{300} \]

---