How do I calculate 15% of 40?

Calculating 15% of 40 involves multiplying 40 by 15% (or 0.15 as a decimal). The formula is:

[15% \times 40 = \frac{15}{100} \times 40 = 0.15 \times 40 = 6]

So, 15% of 40 is 6. This is a fundamental math skill that can be applied to various real-life scenarios. Understanding percentages is important in everyday life, from shopping to understanding interest rates.