The result of multiplying \(-1.5\) by \(-2.1\) is:

\[
(-1.5) \times (-2.1) = 3.15
\]

This is because multiplying two negative numbers gives a positive result.

Would you like more details or have any other questions?

Here are 5 related questions for further practice:
1. What is the product of \(-3.2\) and \(4.5\)?
2. How do you multiply two negative fractions, like \(\frac{-3}{4}\) and \(\frac{-5}{6}\)?
3. What is the product of \(7.3\) and \(-2.5\)?
4. How does multiplying by zero affect any number, positive or negative?
5. What is the result of multiplying three numbers: \(-1.5\), \(2.1\), and \(-3.5\)?

**Tip:** Remember that multiplying two numbers with the same sign always results in a positive number.

Learn how to multiply two negative numbers, -1.5 and -2.1, and understand why the result is positive. This problem covers the basic rule of multiplication for negative numbers. Suitable for students in Grades 6-8.

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