To solve \( 3.9 \div \frac{1}{3} \), we follow these steps:

### Step-by-Step Solution:

1. **Rewrite the division as multiplication**: Dividing by a fraction is the same as multiplying by its reciprocal.
   \[
   3.9 \div \frac{1}{3} = 3.9 \times 3
   \]

2. **Multiply**:
   \[
   3.9 \times 3 = 11.7
   \]

So, \( 3.9 \div \frac{1}{3} = 11.7 \).

Would you like more details or have any questions?

Here are 5 related questions to practice:

1. What is \( 5.2 \div \frac{1}{4} \)?
2. How do you simplify \( 7.8 \times \frac{2}{5} \)?
3. What is \( \frac{3}{4} \times \frac{2}{7} \)?
4. What is \( 4.5 \div 0.5 \)?
5. How do you multiply \( \frac{3}{8} \times 16 \)?

**Tip**: When dividing by a fraction, always multiply by the reciprocal for a quicker solution!

Learn how to solve the problem 3.9 ÷ 1/3 with a step-by-step solution. This guide covers key concepts in dividing by fractions, including the reciprocal rule, and is suitable for students in Grades 6-8.

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