We know that:
\[
\text{Product of two numbers} = \text{HCF} \times \text{LCM}
\]
Let the two numbers be \( a \) and \( b \). We are given:
\[
a \times b = 2880 \quad \text{and} \quad \text{HCF}(a, b) = 12
\]
Using the formula for the product of two numbers, we have:
\[
2880 = 12 \times \text{LCM}(a, b)
\]
Now, solving for LCM:
\[
\text{LCM}(a, b) = \frac{2880}{12} = 240
\]
Step 2: Conclusion.
Therefore, the value of the LCM is 240.
Final Answer:} 240.