What is 3% of 210?

1. Understand the problem: We need to calculate $3\%$ of $210$. The word 'of' in mathematics typically indicates multiplication.

1. Convert the percentage to a decimal: To convert a percentage to a decimal, divide by $100$. Therefore, $3\% = \frac{3}{100} = 0.03$.

3. Perform the multiplication: Now, multiply the decimal by the given number:
$$0.03 \times 210$$

4. Calculate the result:
$$0.03 \times 210 = 3 \times 2.1 = 6.3$$
Alternatively, you can calculate $1\%$ of $210$ by dividing by $100$, which is $2.1$, and then multiply by $3$ to get $2.1 \times 3 = 6.3$.