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The question, written in Basque, translates to: "Among these fractions, which ones are equivalent?"

To determine which fractions are equivalent, let's simplify each one and see if they match.

Given fractions:

1. \( \frac{3}{9} \)
2. \( \frac{4}{6} \)
3. \( \frac{1}{3} \)
4. \( \frac{15}{45} \)
5. \( \frac{2}{3} \)
6. \( \frac{7}{21} \)

### Simplifying each fraction:

1. \( \frac{3}{9} = \frac{1}{3} \)
2. \( \frac{4}{6} = \frac{2}{3} \)
3. \( \frac{1}{3} \) (already simplified)
4. \( \frac{15}{45} = \frac{1}{3} \)
5. \( \frac{2}{3} \) (already simplified)
6. \( \frac{7}{21} = \frac{1}{3} \)

### Results:

- Fractions equivalent to \( \frac{1}{3} \) are: \( \frac{3}{9} \), \( \frac{1}{3} \), \( \frac{15}{45} \), and \( \frac{7}{21} \).
- Fractions equivalent to \( \frac{2}{3} \) are: \( \frac{4}{6} \) and \( \frac{2}{3} \).

### Answer:
The equivalent fractions are:
- \( \frac{1}{3} \): \( \frac{3}{9}, \frac{1}{3}, \frac{15}{45}, \frac{7}{21} \)
- \( \frac{2}{3} \): \( \frac{4}{6}, \frac{2}{3} \)

Would you like more details or have any further questions?

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### Additional Questions:

1. How can you determine if two fractions are equivalent?
2. Why is simplifying fractions useful in mathematics?
3. What is the process for finding the lowest common multiple of two numbers?
4. How do you convert a fraction to a decimal to check equivalence?
5. Can you think of a real-world scenario where equivalent fractions are used?

### Tip:
When checking for equivalent fractions, simplify each fraction to its lowest terms.

Zatiki hauetatik, zeintzuk dira baliokideak? (Among these fractions, which ones are equivalent?)

Identify which fractions are equivalent among the given fractions: 3/9, 4/6, 1/3, 15/45, 2/3, and 7/21. This exercise involves simplifying fractions and understanding fraction equivalence, suitable for Grade 5-7 students.

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