The expression \( 3.9 + \frac{1}{3} \) can be calculated by converting both numbers into decimal form.

\[
3.9 + \frac{1}{3} = 3.9 + 0.3333\ldots
\]

Adding these together:

\[
3.9 + 0.3333\ldots = 4.2333\ldots
\]

So, \( 3.9 + \frac{1}{3} \approx 4.2333 \), or more precisely \( 4 \frac{7}{30} \) in fractional form.

Would you like a breakdown of how this works, or any further details?

Here are 5 related questions:
1. How do you convert fractions into decimals?
2. What is the decimal approximation of repeating decimals like \( \frac{1}{3} \)?
3. How do you add fractions to whole numbers?
4. Can you express \( 4.2333\ldots \) as an exact fraction?
5. What is the best way to handle rounding for repeating decimals?

**Tip**: When working with repeating decimals, it's helpful to keep a few extra decimal places for more precision before rounding.

Discover how to add 3.9 and ⅓ by converting the fraction to a decimal and performing the addition. This step-by-step solution shows the process for converting fractions into decimals and explains decimal addition, suitable for Grades 6-8.

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