1. The problem is to multiply the numbers 0.15 and 1.5. 2. The formula for multiplication is simply $a \times b = c$, where $a$ and $b$ are the numbers to multiply. 3. Multiply the numbers: $0.15 \times 1.5$. 4. Calculate step-by-step: $0.15 \times 1.5 = 0.225$. 5. So, the product of 0.15 and 1.5 is $0.225$.