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The image contains six fraction-related problems that require finding equivalent fractions or decimals. I will help you solve each one by converting the expressions step-by-step.

1. **Problem a)**  
   \[
   \frac{4}{25} = \frac{1}{100}
   \]
   To check if these are equivalent, let's simplify the left side:
   \[
   \frac{4}{25} = \frac{4 \times 4}{25 \times 4} = \frac{16}{100} \neq \frac{1}{100}.
   \]
   So, these fractions are not equal.

2. **Problem b)**  
   \[
   \frac{16}{20} = 3
   \]
   Simplify the left side:
   \[
   \frac{16}{20} = \frac{4}{5}.
   \]
   This does not equal 3. Thus, the expression is incorrect.

3. **Problem c)**  
   \[
   \frac{1}{25} = \frac{1}{100}.
   \]
   This is incorrect because the fractions are not equivalent.

4. **Problem d)**  
   \[
   \frac{3}{10} = 3,
   \]
   \[
   \frac{3}{10} = 0.3.
   \]
   This is also not equal to 3, so this expression is incorrect.

5. **Problem e)**  
   \[
   0.45 = \frac{45}{100} = \frac{9}{40}.
   \]
   Let's simplify:
   \[
   0.45 = \frac{45}{100}, \quad \frac{45}{100} = \frac{9}{20},
   \]
   so the correct simplification is \(\frac{9}{20}\), not \(\frac{9}{40}\).

6. **Problem f)**  
   \[
   2.8 = \frac{28}{10} = 2\frac{2}{5}.
   \]
   Simplifying:
   \[
   2.8 = \frac{28}{10} = 2\frac{2}{5},
   \]
   which simplifies correctly.

Would you like more details on any of these? 

Here are some related questions to deepen your understanding:
1. What is the process of simplifying a fraction?
2. How do you convert a decimal into a fraction?
3. What is an equivalent fraction?
4. Why do some fractions simplify while others do not?
5. How can we check if two fractions are equivalent?

**Tip**: Always simplify fractions by dividing both the numerator and denominator by their greatest common divisor (GCD).

The image contains six fraction-related problems that require finding equivalent fractions or decimals. Solve the expressions.

This problem set involves solving fraction-related problems by converting fractions and decimals and simplifying expressions. These exercises focus on core math concepts such as fractions, decimals, and the process of simplification, suitable for students in Grades 4-6.

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